Merge pull request #8283 from edx/hotfix/2015-05-29

Hotfix/2015 05 29

common/lib/capa/capa/capa_problem.py

@@ -139,7 +139,6 @@ class LoncapaProblem(object):
         self.do_reset()
         self.problem_id = id
         self.capa_system = capa_system
-        self.question_label = ""
 
         state = state or {}
 
@@ -733,7 +732,6 @@ class LoncapaProblem(object):
                 'status': status,
                 'id': input_id,
                 'input_state': self.input_state[input_id],
-                'question_label': self.question_label if self.question_label else None,
                 'answervariable': answervariable,
                 'feedback': {
                     'message': msg,
@@ -764,12 +762,8 @@ class LoncapaProblem(object):
         tree = etree.Element(problemtree.tag)
         for item in problemtree:
             item_xhtml = self._extract_html(item)
-            item_sibling = self.sibling_for_item(problemtree, item)
             if item_xhtml is not None:
-                if item_xhtml.tag == "legend" and item_sibling is not None and item_sibling in self.responders:
-                    self.question_label = item_xhtml.text
-                else:
-                    tree.append(item_xhtml)
+                tree.append(item_xhtml)
 
         if tree.tag in html_transforms:
             tree.tag = html_transforms[problemtree.tag]['tag']
@@ -840,18 +834,3 @@ class LoncapaProblem(object):
         for solution in tree.findall('.//solution'):
             solution.attrib['id'] = "%s_solution_%i" % (self.problem_id, solution_id)
             solution_id += 1
-
-    def sibling_for_item(self, tree, node):
-        """
-        Check if node exist in problem tree and return next sibling if exist
-        else return None
-        """
-        problem_tree = tree.xpath('//problem/*')
-        if node in problem_tree:
-            node_index = problem_tree.index(node)
-            try:
-                return problem_tree[node_index + 1]
-            except IndexError:
-                return None
-        else:
-            return None

common/lib/capa/capa/inputtypes.py

@@ -214,7 +214,6 @@ class InputTypeBase(object):
         self.hintmode = feedback.get('hintmode', None)
         self.input_state = state.get('input_state', {})
         self.answervariable = state.get("answervariable", None)
-        self.question_label = state.get("question_label", None)
 
         # put hint above msg if it should be displayed
         if self.hintmode == 'always':
@@ -314,7 +313,6 @@ class InputTypeBase(object):
         context.update(self._extra_context())
         if self.answervariable:
             context.update({'answervariable': self.answervariable})
-        context.update({'question_label': self.question_label if self.question_label is not None else ""})
         return context
 
     def _extra_context(self):

common/lib/capa/capa/templates/choicegroup.html

@@ -17,8 +17,8 @@
     % endif
     </div>
 
-    <fieldset>
-        <legend>${question_label}</legend>
+    <fieldset role="${input_type}group" aria-label="${label}">
+
         % for choice_id, choice_description in choices:
         <label for="input_${id}_${choice_id}"
             ## If the student has selected this choice...

common/lib/capa/capa/tests/test_html_render.py

@@ -175,7 +175,6 @@ class CapaHtmlRenderTest(unittest.TestCase):
             'label': '',
             'value': '',
             'preprocessor': None,
-            'question_label': '',
             'msg': '',
             'inline': False,
             'hidden': False,

common/lib/capa/capa/tests/test_input_templates.py

@@ -126,7 +126,6 @@ class ChoiceGroupTemplateTest(TemplateTestCase):
         self.context = {'id': '1',
                         'choices': choices,
                         'status': Status('correct'),
-                        'question_label': 'test',
                         'label': 'test',
                         'input_type': 'checkbox',
                         'name_array_suffix': '1',
@@ -142,7 +141,6 @@ class ChoiceGroupTemplateTest(TemplateTestCase):
         self.context['status'] = Status('correct')
         self.context['input_type'] = 'checkbox'
         self.context['value'] = ['1', '2']
-        self.context['question_label'] = ['']
 
         # Should mark the entire problem correct
         xml = self.render_to_xml(self.context)
@@ -224,8 +222,8 @@ class ChoiceGroupTemplateTest(TemplateTestCase):
         (not the entire problem) is marked correct.
         """
         conditions = [
-            {'input_type': 'radio', 'question_label': '', 'value': '2'},
-            {'input_type': 'radio', 'question_label': '', 'value': ['2']}]
+            {'input_type': 'radio', 'value': '2'},
+            {'input_type': 'radio', 'value': ['2']}]
 
         self.context['status'] = Status('correct')
 
@@ -272,16 +270,16 @@ class ChoiceGroupTemplateTest(TemplateTestCase):
         """
 
         conditions = [
-            {'input_type': 'radio', 'status': Status('correct'), 'question_label': '', 'value': ''},
-            {'input_type': 'radio', 'status': Status('correct'), 'question_label': '', 'value': '2'},
-            {'input_type': 'radio', 'status': Status('correct'), 'question_label': '', 'value': ['2']},
-            {'input_type': 'radio', 'status': Status('incorrect'), 'question_label': '', 'value': '2'},
-            {'input_type': 'radio', 'status': Status('incorrect'), 'question_label': '', 'value': []},
-            {'input_type': 'radio', 'status': Status('incorrect'), 'question_label': '', 'value': ['2']},
-            {'input_type': 'checkbox', 'status': Status('correct'), 'question_label': '', 'value': []},
-            {'input_type': 'checkbox', 'status': Status('correct'), 'question_label': '', 'value': ['2']},
-            {'input_type': 'checkbox', 'status': Status('incorrect'), 'question_label': '', 'value': []},
-            {'input_type': 'checkbox', 'status': Status('incorrect'), 'question_label': '', 'value': ['2']}]
+            {'input_type': 'radio', 'status': Status('correct'), 'value': ''},
+            {'input_type': 'radio', 'status': Status('correct'), 'value': '2'},
+            {'input_type': 'radio', 'status': Status('correct'), 'value': ['2']},
+            {'input_type': 'radio', 'status': Status('incorrect'), 'value': '2'},
+            {'input_type': 'radio', 'status': Status('incorrect'), 'value': []},
+            {'input_type': 'radio', 'status': Status('incorrect'), 'value': ['2']},
+            {'input_type': 'checkbox', 'status': Status('correct'), 'value': []},
+            {'input_type': 'checkbox', 'status': Status('correct'), 'value': ['2']},
+            {'input_type': 'checkbox', 'status': Status('incorrect'), 'value': []},
+            {'input_type': 'checkbox', 'status': Status('incorrect'), 'value': ['2']}]
 
         self.context['show_correctness'] = 'never'
         self.context['submitted_message'] = 'Test message'
@@ -317,9 +315,9 @@ class ChoiceGroupTemplateTest(TemplateTestCase):
         """
 
         conditions = [
-            {'input_type': 'radio', 'status': Status('unsubmitted'), 'question_label': '', 'value': ''},
-            {'input_type': 'radio', 'status': Status('unsubmitted'), 'question_label': '', 'value': []},
-            {'input_type': 'checkbox', 'status': Status('unsubmitted'), 'question_label': '', 'value': []},
+            {'input_type': 'radio', 'status': Status('unsubmitted'), 'value': ''},
+            {'input_type': 'radio', 'status': Status('unsubmitted'), 'value': []},
+            {'input_type': 'checkbox', 'status': Status('unsubmitted'), 'value': []},
 
             # These tests expose bug #365
             # When the bug is fixed, uncomment these cases.
@@ -343,8 +341,8 @@ class ChoiceGroupTemplateTest(TemplateTestCase):
 
     def test_label(self):
         xml = self.render_to_xml(self.context)
-        xpath = "//fieldset/legend"
-        self.assert_has_text(xml, xpath, self.context['question_label'])
+        xpath = "//fieldset[@aria-label='%s']" % self.context['label']
+        self.assert_has_xpath(xml, xpath, self.context)
 
 
 class TextlineTemplateTest(TemplateTestCase):
@@ -927,7 +925,7 @@ class ChoiceTextGroupTemplateTest(TemplateTestCase):
         (not the entire problem) is marked correct."""
 
         conditions = [
-            {'input_type': 'radio', 'question_label': '', 'value': self.VALUE_DICT}]
+            {'input_type': 'radio', 'value': self.VALUE_DICT}]
 
         self.context['status'] = 'correct'
 
@@ -947,7 +945,7 @@ class ChoiceTextGroupTemplateTest(TemplateTestCase):
         (not the entire problem) is marked incorrect."""
 
         conditions = [
-            {'input_type': 'radio', 'question_label': '', 'value': self.VALUE_DICT}]
+            {'input_type': 'radio', 'value': self.VALUE_DICT}]
 
         self.context['status'] = 'incorrect'
 

common/lib/capa/capa/tests/test_inputtypes.py

@@ -61,7 +61,6 @@ class OptionInputTest(unittest.TestCase):
             'value': 'Down',
             'options': [('Up', 'Up'), ('Down', 'Down'), ('Don\'t know', 'Don\'t know')],
             'status': inputtypes.Status('answered'),
-            'question_label': '',
             'label': '',
             'msg': '',
             'inline': False,
@@ -122,7 +121,6 @@ class ChoiceGroupTest(unittest.TestCase):
             'id': 'sky_input',
             'value': 'foil3',
             'status': inputtypes.Status('answered'),
-            'question_label': '',
             'label': '',
             'msg': '',
             'input_type': expected_input_type,
@@ -176,7 +174,6 @@ class JavascriptInputTest(unittest.TestCase):
             'STATIC_URL': '/dummy-static/',
             'id': 'prob_1_2',
             'status': inputtypes.Status('unanswered'),
-            'question_label': '',
             # 'label': '',
             'msg': '',
             'value': '3',
@@ -210,7 +207,6 @@ class TextLineTest(unittest.TestCase):
             'id': 'prob_1_2',
             'value': 'BumbleBee',
             'status': inputtypes.Status('unanswered'),
-            'question_label': '',
             'label': 'testing 123',
             'size': size,
             'msg': '',
@@ -243,7 +239,6 @@ class TextLineTest(unittest.TestCase):
             'id': 'prob_1_2',
             'value': 'BumbleBee',
             'status': inputtypes.Status('unanswered'),
-            'question_label': '',
             'label': '',
             'size': size,
             'msg': '',
@@ -288,7 +283,6 @@ class TextLineTest(unittest.TestCase):
                 'id': 'prob_1_2',
                 'value': 'BumbleBee',
                 'status': inputtypes.Status('unanswered'),
-                'question_label': '',
                 'label': '',
                 'size': size,
                 'msg': '',
@@ -330,7 +324,6 @@ class FileSubmissionTest(unittest.TestCase):
             'STATIC_URL': '/dummy-static/',
             'id': 'prob_1_2',
             'status': inputtypes.Status('queued'),
-            'question_label': '',
             'label': '',
             'msg': the_input.submitted_msg,
             'value': 'BumbleBee.py',
@@ -381,7 +374,6 @@ class CodeInputTest(unittest.TestCase):
             'id': 'prob_1_2',
             'value': 'print "good evening"',
             'status': inputtypes.Status('queued'),
-            'question_label': '',
             # 'label': '',
             'msg': the_input.submitted_msg,
             'mode': mode,
@@ -437,7 +429,6 @@ class MatlabTest(unittest.TestCase):
             'id': 'prob_1_2',
             'value': 'print "good evening"',
             'status': inputtypes.Status('queued'),
-            'question_label': '',
             # 'label': '',
             'msg': self.the_input.submitted_msg,
             'mode': self.mode,
@@ -469,7 +460,6 @@ class MatlabTest(unittest.TestCase):
             'id': 'prob_1_2',
             'value': 'print "good evening"',
             'status': inputtypes.Status('queued'),
-            'question_label': '',
             # 'label': '',
             'msg': the_input.submitted_msg,
             'mode': self.mode,
@@ -501,7 +491,6 @@ class MatlabTest(unittest.TestCase):
                 'id': 'prob_1_2',
                 'value': 'print "good evening"',
                 'status': inputtypes.Status(status),
-                'question_label': '',
                 # 'label': '',
                 'msg': '',
                 'mode': self.mode,
@@ -533,7 +522,6 @@ class MatlabTest(unittest.TestCase):
             'id': 'prob_1_2',
             'value': 'print "good evening"',
             'status': inputtypes.Status('queued'),
-            'question_label': '',
             # 'label': '',
             'msg': the_input.submitted_msg,
             'mode': self.mode,
@@ -660,14 +648,7 @@ class MatlabTest(unittest.TestCase):
         output = self.the_input.get_html()
         self.assertEqual(
             etree.tostring(output),
-            " ".join(textwrap.dedent("""
-            <div>{\'status\': Status(\'queued\'), \'button_enabled\': True, \'rows\': \'10\', \'queue_len\': \'3\',
-            \'question_label\': \'\',  \'mode\': \'\', \'cols\': \'80\', \'STATIC_URL\': \'/dummy-static/\',
-            \'linenumbers\': \'true\', \'queue_msg\': \'\', \'value\': \'print "good evening"\',
-            \'msg\': u\'Submitted. As soon as a response is returned, this message will be replaced by that feedback.\',
-            \'matlab_editor_js\': \'/dummy-static/js/vendor/CodeMirror/octave.js\', \'hidden\': \'\',
-            \'id\': \'prob_1_2\', \'tabsize\': 4}</div>
-            """).replace('\n', ' ').split())
+            """<div>{\'status\': Status(\'queued\'), \'button_enabled\': True, \'rows\': \'10\', \'queue_len\': \'3\', \'mode\': \'\', \'cols\': \'80\', \'STATIC_URL\': \'/dummy-static/\', \'linenumbers\': \'true\', \'queue_msg\': \'\', \'value\': \'print "good evening"\', \'msg\': u\'Submitted. As soon as a response is returned, this message will be replaced by that feedback.\', \'matlab_editor_js\': \'/dummy-static/js/vendor/CodeMirror/octave.js\', \'hidden\': \'\', \'id\': \'prob_1_2\', \'tabsize\': 4}</div>"""
         )
 
         # test html, that is correct HTML5 html, but is not parsable by XML parser.
@@ -758,7 +739,6 @@ class MatlabTest(unittest.TestCase):
             'id': 'prob_1_2',
             'value': 'print "good evening"',
             'status': inputtypes.Status('queued'),
-            'question_label': '',
             'msg': self.the_input.submitted_msg,
             'mode': self.mode,
             'rows': self.rows,
@@ -868,7 +848,6 @@ class SchematicTest(unittest.TestCase):
             'id': 'prob_1_2',
             'value': value,
             'status': inputtypes.Status('unsubmitted'),
-            'question_label': '',
             'label': '',
             'msg': '',
             'initial_value': initial_value,
@@ -913,7 +892,6 @@ class ImageInputTest(unittest.TestCase):
             'id': 'prob_1_2',
             'value': value,
             'status': inputtypes.Status('unsubmitted'),
-            'question_label': '',
             'label': '',
             'width': width,
             'height': height,
@@ -969,7 +947,6 @@ class CrystallographyTest(unittest.TestCase):
             'id': 'prob_1_2',
             'value': value,
             'status': inputtypes.Status('unsubmitted'),
-            'question_label': '',
             # 'label': '',
             'msg': '',
             'width': width,
@@ -1012,7 +989,6 @@ class VseprTest(unittest.TestCase):
             'id': 'prob_1_2',
             'value': value,
             'status': inputtypes.Status('unsubmitted'),
-            'question_label': '',
             'msg': '',
             'width': width,
             'height': height,
@@ -1046,7 +1022,6 @@ class ChemicalEquationTest(unittest.TestCase):
             'id': 'prob_1_2',
             'value': 'H2OYeah',
             'status': inputtypes.Status('unanswered'),
-            'question_label': '',
             'label': '',
             'msg': '',
             'size': self.size,
@@ -1136,7 +1111,6 @@ class FormulaEquationTest(unittest.TestCase):
             'id': 'prob_1_2',
             'value': 'x^2+1/2',
             'status': inputtypes.Status('unanswered'),
-            'question_label': '',
             'label': '',
             'msg': '',
             'size': self.size,
@@ -1266,7 +1240,6 @@ class DragAndDropTest(unittest.TestCase):
             'id': 'prob_1_2',
             'value': value,
             'status': inputtypes.Status('unsubmitted'),
-            'question_label': '',
             # 'label': '',
             'msg': '',
             'drag_and_drop_json': json.dumps(user_input)
@@ -1319,7 +1292,6 @@ class AnnotationInputTest(unittest.TestCase):
             'STATIC_URL': '/dummy-static/',
             'id': 'annotation_input',
             'status': inputtypes.Status('answered'),
-            'question_label': '',
             # 'label': '',
             'msg': '',
             'title': 'foo',
@@ -1396,7 +1368,6 @@ class TestChoiceText(unittest.TestCase):
         expected = {
             'STATIC_URL': '/dummy-static/',
             'msg': '',
-            'question_label': '',
             'label': '',
             'input_type': expected_input_type,
             'choices': choices,

common/lib/xmodule/xmodule/js/spec/problem/edit_spec.coffee

@@ -509,7 +509,7 @@ describe 'MarkdownEditingDescriptor', ->
         [Explanation]
         """)
       expect(data).toEqual("""<problem>
-    <legend>Who lead the civil right movement in the United States of America?</legend>
+    <p>Who lead the civil right movement in the United States of America?</p>
     <stringresponse answer="w*.?s*Luther Kings*.*" type="ci regexp" >
       <textline label="Who lead the civil right movement in the United States of America?" size="20"/>
     </stringresponse>
@@ -541,14 +541,14 @@ describe 'MarkdownEditingDescriptor', ->
       expect(data).toEqual("""<problem>
     <p>France is a country in Europe.</p>
     
-    <legend>What is the capital of France?</legend>
+    <p>What is the capital of France?</p>
     <stringresponse answer="Paris" type="ci" >
       <textline label="What is the capital of France?" size="20"/>
     </stringresponse>
     
     <p>Germany is a country in Europe, too.</p>
     
-    <legend>What is the capital of Germany?</legend>
+    <p>What is the capital of Germany?</p>
     <multiplechoiceresponse>
       <choicegroup label="What is the capital of Germany?" type="MultipleChoice">
         <choice correct="false">Bonn</choice>
@@ -574,12 +574,11 @@ describe 'MarkdownEditingDescriptor', ->
         ( ) Hamburg
         (x) Berlin
         ( ) Donut
-
         """)
       expect(data).toEqual("""<problem>
     <p>France is a country in Europe.</p>
-
-    <legend>What is the capital of France?</legend>
+    
+    <p>What is the capital of France?</p>
     <stringresponse answer="Paris" type="ci" >
       <textline label="What is the capital of France?" size="20"/>
     </stringresponse>
@@ -595,8 +594,8 @@ describe 'MarkdownEditingDescriptor', ->
         <choice correct="false">Donut</choice>
       </choicegroup>
     </multiplechoiceresponse>
-
-
+    
+    
     </problem>""")
     it 'tests malformed labels', ->
       data = MarkdownEditingDescriptor.markdownToXml("""
@@ -605,7 +604,7 @@ describe 'MarkdownEditingDescriptor', ->
         >>What is the capital of France?<
         = Paris
 
-        >>What is the capital of <<Germany?<<
+        blah>>What is the capital of <<Germany?<<
         ( ) Bonn
         ( ) Hamburg
         (x) Berlin
@@ -619,7 +618,7 @@ describe 'MarkdownEditingDescriptor', ->
       <textline size="20"/>
     </stringresponse>
     
-    <legend>What is the capital of Germany?</legend>
+    <p>blahWhat is the capital of Germany?</p>
     <multiplechoiceresponse>
       <choicegroup label="What is the capital of &lt;&lt;Germany?" type="MultipleChoice">
         <choice correct="false">Bonn</choice>
@@ -637,7 +636,7 @@ describe 'MarkdownEditingDescriptor', ->
       = 3.14159 +- .02
       """)
       expect(data).toEqual("""<problem>
-    <legend>Enter the numerical value of Pi:</legend>
+    <p>Enter the numerical value of Pi:</p>
     <numericalresponse answer="3.14159">
       <responseparam type="tolerance" default=".02" />
       <formulaequationinput label="Enter the numerical value of Pi:" />
@@ -651,7 +650,7 @@ describe 'MarkdownEditingDescriptor', ->
       = Paris
       """)
       expect(data).toEqual("""<problem>
-    <legend>What is the "capital" of France & the 'best' > place < to live"?</legend>
+    <p>What is the "capital" of France & the 'best' > place < to live"?</p>
     <stringresponse answer="Paris" type="ci" >
       <textline label="What is the &quot;capital&quot; of France &amp; the &apos;best&apos; &gt; place &lt; to live&quot;?" size="20"/>
     </stringresponse>

common/lib/xmodule/xmodule/js/src/problem/edit.coffee

@@ -371,9 +371,7 @@ class @MarkdownEditingDescriptor extends XModule.Descriptor
             .replace(/>/g, '>')
             .replace(/"/g, '"')
             .replace(/'/g, ''');
-          line = line.replace(/>>/g, '<legend>');
-          line = line.replace(/<+$/g, '</legend>');
-          line = line.replace(/<</g, '');
+          line = line.replace(/>>|<</g, '');
         } else if (line.match(/<\w+response/) && didinput && curlabel == prevlabel) {
           // reset label to prevent gobbling up previous one (if multiple questions)
           curlabel = '';

common/lib/xmodule/xmodule/templates/problem/checkboxes_response.yaml

@@ -16,7 +16,6 @@ metadata:
        [x] French
        [ ] Hungarian
 
-
        Note: Make sure you select all of the correct options—there may be more than one!
 
        [explanation]
@@ -29,16 +28,18 @@ data: |
         <p>When you add the component, be sure to select <strong>Settings</strong> 
         to specify a <strong>Display Name</strong> and other values that apply.</p>
         <p>You can use the following example problem as a model.</p>
-        <legend>The following languages are in the Indo-European family:</legend>
-        <choiceresponse>
-          <checkboxgroup direction="vertical">
-            <choice correct="true" name="urdu">Urdu</choice>
-            <choice correct="false" name="finnish">Finnish</choice>
-            <choice correct="true" name="marathi">Marathi</choice>
-            <choice correct="true" name="french">French</choice>
-            <choice correct="false" name="hungarian">Hungarian</choice>
-          </checkboxgroup>
-        </choiceresponse>
+        <fieldset>
+          <legend>The following languages are in the Indo-European family:</legend>
+          <choiceresponse>
+            <checkboxgroup direction="vertical">
+              <choice correct="true" name="urdu">Urdu</choice>
+              <choice correct="false" name="finnish">Finnish</choice>
+              <choice correct="true" name="marathi">Marathi</choice>
+              <choice correct="true" name="french">French</choice>
+              <choice correct="false" name="hungarian">Hungarian</choice>
+            </checkboxgroup>
+          </choiceresponse>
+        </fieldset>
         <p><strong>Note</strong>: Make sure you select all of the correct options—there may be more than one!</p>
         <solution>
          <div class="detailed-solution">

common/lib/xmodule/xmodule/templates/problem/multiplechoice.yaml

@@ -15,7 +15,6 @@ metadata:
        (x) Indonesia
        ( ) Russia
 
-
        [explanation]
        According to September 2014 estimates:
        The population of Indonesia is approximately 250 million.
@@ -31,6 +30,7 @@ data: |
    <p>When you add the problem, be sure to select <strong>Settings</strong> 
    to specify a <strong>Display Name</strong> and other values that apply.</p>
    <p>You can use the following example problem as a model.</p>
+   <fieldset>
       <legend>Which of the following countries has the largest population?</legend>
       <multiplechoiceresponse>
        <choicegroup type="MultipleChoice">
@@ -40,6 +40,7 @@ data: |
           <choice correct="false" name="russia">Russia</choice>
        </choicegroup>
       </multiplechoiceresponse>
+    </fieldset>
     <solution>
       <div class="detailed-solution">
         <p>Explanation</p>

common/lib/xmodule/xmodule/templates/problem/numericalresponse.yaml

@@ -14,12 +14,11 @@ metadata:
         >>How many miles away from Earth is the sun? Use scientific notation to answer.<<
 
         = 9.3*10^6 
-        or= 9.296*10^6
-
+        or= 9.296*10^6 
 
         >>The square of what number is -100?<<
 
-        = 10*i
+        = 10*i 
 
         [explanation]
         The sun is 93,000,000, or 9.3*10^6, miles away from Earth.

common/lib/xmodule/xmodule/templates/problem/optionresponse.yaml

@@ -14,7 +14,6 @@ metadata:
 
           [[(India), Spain, China, Bermuda]]
 
-
           [explanation]
           India became an independent nation on August 15, 1947.
           [explanation]

common/lib/xmodule/xmodule/templates/problem/string_response.yaml

@@ -14,7 +14,7 @@ metadata:
         = Nanjing Higher Normal Institute
         or= National Central University
         or= Nanjing University
-        
+
         [explanation]
         Nanjing Higher Normal Institute first admitted female students in 1920.
         [explanation]