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hubiera alterado
Past perfect subjunctive yo conjugation of alterar.
hubiera alterado
Past perfect subjunctive él/ella/usted conjugation of alterar.

alterar

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Si se hubiera alterado un solo número durante la partida, la suma de verificación cambiaría de forma tan evidente que te darías cuenta inmediatamente.
If even a single number were changed during the game, the checksum would change so completely that you would notice immediately.
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