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@@ -301,15 +301,9 @@ class MultipleAnswerTrueFalseDegreeCertainty extends Question
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}
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/**
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- * Show result table headers.
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- *
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- * @param Exercise $exercise
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- * @param int $counter
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- * @param float $score
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- *
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- * @return string|null
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+ * {@inheritdoc}
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*/
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- public function return_header($exercise, $counter = null, $score = null)
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+ public function return_header(Exercise $exercise, $counter = null, $score = [])
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{
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$header = parent::return_header($exercise, $counter, $score);
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$header .= '<table class="'
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