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Error 0004

from UPDATE `wp_mlw_questions` SET `question_name` = ‘<p style="text-align: left;">31.\[(3×\frac{21}{3})–(\frac{2}{3})\]<sup>2</sup> =…</p>’, `answer_array` = ‘a:5:{i:0;a:3:{i:0;s:29:”<left>\[20\frac{5}{9}\]”;i:1;d:4;i:2;i:1;}i:1;a:3:{i:0;s:17:”\[20\frac{1}{4}\]”;i:1;d:-1;i:2;i:0;}i:2;a:3:{i:0;s:17:”\[20\frac{1}{2}\]”;i:1;d:-1;i:2;i:0;}i:3;a:3:{i:0;s:17:”\[20\frac{5}{6}\]”;i:1;d:-1;i:2;i:0;}i:4;a:3:{i:0;s:17:”\[20\frac{7}{9}\]”;i:1;d:-1;i:2;i:0;}}’, `question_answer_info` = ”, `comments` = 1, `hints` = ”, `question_order` = 31, `question_type_new` = ‘0’, `question_settings` = ‘a:1:{s:8:”required”;i:1;}’, `category` = ” WHERE `question_id` = 1038