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256 iThink

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It depends on combinations of how many. There is

1 combination of 4 letters out of 4,

4 combinations of 3 letters out of 4,

6 combinations of 2 letters out of 4,

4 combinations of 1 letter out of 4.

Than makes 15 (= 24-1) in all. Well below the 256 suggested by the previous answer.

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13y ago

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