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<?php for ($i = 0; $i < 54; $i++) { echo "DROP INDEX `user_id_2` ON `feeds_{$i}`;\n"; }
based on bGGvT
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.6
DROP INDEX `user_id_2` ON `feeds_0`; DROP INDEX `user_id_2` ON `feeds_1`; DROP INDEX `user_id_2` ON `feeds_2`; DROP INDEX `user_id_2` ON `feeds_3`; DROP INDEX `user_id_2` ON `feeds_4`; DROP INDEX `user_id_2` ON `feeds_5`; DROP INDEX `user_id_2` ON `feeds_6`; DROP INDEX `user_id_2` ON `feeds_7`; DROP INDEX `user_id_2` ON `feeds_8`; DROP INDEX `user_id_2` ON `feeds_9`; DROP INDEX `user_id_2` ON `feeds_10`; DROP INDEX `user_id_2` ON `feeds_11`; DROP INDEX `user_id_2` ON `feeds_12`; DROP INDEX `user_id_2` ON `feeds_13`; DROP INDEX `user_id_2` ON `feeds_14`; DROP INDEX `user_id_2` ON `feeds_15`; DROP INDEX `user_id_2` ON `feeds_16`; DROP INDEX `user_id_2` ON `feeds_17`; DROP INDEX `user_id_2` ON `feeds_18`; DROP INDEX `user_id_2` ON `feeds_19`; DROP INDEX `user_id_2` ON `feeds_20`; DROP INDEX `user_id_2` ON `feeds_21`; DROP INDEX `user_id_2` ON `feeds_22`; DROP INDEX `user_id_2` ON `feeds_23`; DROP INDEX `user_id_2` ON `feeds_24`; DROP INDEX `user_id_2` ON `feeds_25`; DROP INDEX `user_id_2` ON `feeds_26`; DROP INDEX `user_id_2` ON `feeds_27`; DROP INDEX `user_id_2` ON `feeds_28`; DROP INDEX `user_id_2` ON `feeds_29`; DROP INDEX `user_id_2` ON `feeds_30`; DROP INDEX `user_id_2` ON `feeds_31`; DROP INDEX `user_id_2` ON `feeds_32`; DROP INDEX `user_id_2` ON `feeds_33`; DROP INDEX `user_id_2` ON `feeds_34`; DROP INDEX `user_id_2` ON `feeds_35`; DROP INDEX `user_id_2` ON `feeds_36`; DROP INDEX `user_id_2` ON `feeds_37`; DROP INDEX `user_id_2` ON `feeds_38`; DROP INDEX `user_id_2` ON `feeds_39`; DROP INDEX `user_id_2` ON `feeds_40`; DROP INDEX `user_id_2` ON `feeds_41`; DROP INDEX `user_id_2` ON `feeds_42`; DROP INDEX `user_id_2` ON `feeds_43`; DROP INDEX `user_id_2` ON `feeds_44`; DROP INDEX `user_id_2` ON `feeds_45`; DROP INDEX `user_id_2` ON `feeds_46`; DROP INDEX `user_id_2` ON `feeds_47`; DROP INDEX `user_id_2` ON `feeds_48`; DROP INDEX `user_id_2` ON `feeds_49`; DROP INDEX `user_id_2` ON `feeds_50`; DROP INDEX `user_id_2` ON `feeds_51`; DROP INDEX `user_id_2` ON `feeds_52`; DROP INDEX `user_id_2` ON `feeds_53`;