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     *
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     *
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     * @param int $state the answer state
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     * @param int $state the answer state
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     * @param string $answer the extra text to display (default null)
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     * @param string $answer the extra text to display (default null)
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     * @return stdClass with "answer" text and the state attribute to be displayed
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     * @return stdClass with "answer" text and the state attribute to be displayed
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     */
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     */
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    protected function get_answer(int $state, string $answer = null): stdClass {
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    protected function get_answer(int $state, ?string $answer = null): stdClass {
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        $states = [
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        $states = [
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            self::CORRECT => 'correct',
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            self::CORRECT => 'correct',
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            self::INCORRECT => 'incorrect',
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            self::INCORRECT => 'incorrect',
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            self::CHECKED => 'checked',
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            self::CHECKED => 'checked',
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            self::UNCHECKED => 'unchecked',
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            self::UNCHECKED => 'unchecked',