How many times can the letter "a" appear in the English alphabet?
The letter "a" appears only once in the English alphabet, as an alphabet is a standard set of letters that represent the phonemes of a language, and contains only one of each character.
Below is an instruction that describes a task, write a response that appropriately completes the request.

### Instruction:
How many times can the letter "a" appear in the English alphabet?

### Response:
The letter "a" appears only once in the English alphabet, as an alphabet is a standard set of letters that represent the phonemes of a language, and contains only one of each character.