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     *                    the second string index is the 'class' that sub-question part can be classified into.
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     *                    the second string index is the 'class' that sub-question part can be classified into.
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     *                    Value in array is instance of {@link \question_possible_response}
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     *                    Value in array is instance of {@link \question_possible_response}
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     *                    This is the return value from {@link \question_type::get_possible_responses()}
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     *                    This is the return value from {@link \question_type::get_possible_responses()}
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     *                    see that method for fuller documentation.
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     *                    see that method for fuller documentation.
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     */
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     */
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    public function __construct(array $possiblereponses = null) {
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    public function __construct(?array $possiblereponses = null) {
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        if ($possiblereponses !== null) {
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        if ($possiblereponses !== null) {
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            $this->possibleresponses = $possiblereponses;
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            $this->possibleresponses = $possiblereponses;
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        }
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        }
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    }
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    }