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From what I recall of world war II history, the Japanese didn't really use their submarine force to the best of its capabilities, which contributed to its defeat in world war II.

Supposing that the Japanese decided to reverse this decision (think of whatever would be necessary to cause this) what effect could it have on the pacific war? NOTE: I don't think this change would make Japan win the war, I'm just wondering if it would have had any effect on the outcome.
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