Valid/in-valid Alphabets?

1.	Valid/in-valid Alphabets?
Answer» Any alphabet is VALID if any of its letter does not APPEAR in the START of any other letter OTHERWISE it is INVALID. Any alphabet is valid if any of its letter does not appear in the start of any other letter otherwise it is invalid.

Answer»

Any alphabet is VALID if any of its letter does not APPEAR in the START of any other letter OTHERWISE it is INVALID.

Any alphabet is valid if any of its letter does not appear in the start of any other letter otherwise it is invalid.

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