The answer is 6.
The pairs of letters in the word "CASTRAPHONE" that have as many letters between them in the word as in the alphabet are:
- ON - the letters "O" and "N" are 2nd and 14th letters in the alphabet, and they are 2 letters apart in the word.
- HONE - the letters "H" and "O" are 8th and 15th letters in the alphabet, and they are 7 letters apart in the word.
- ST - the letters "S" and "T" are 19th and 20th letters in the alphabet, and they are 1 letter apart in the word.
- TRAPHO - the letters "T", "R", "A", "P", and "H" are 20th, 18th, 1st, 16th, and 8th letters in the alphabet, and they are 7, 6, 5, 4, and 3 letters apart in the word.
- TRAPHON - the letters "T", "R", "A", "P", "H", and "O" are 20th, 18th, 1st, 16th, 8th, and 15th letters in the alphabet, and they are 7, 6, 5, 4, 3, and 7 letters apart in the word.
- RAP - the letters "R", "A", and "P" are 18th, 1st, and 16th letters in the alphabet, and they are 6, 5, and 4 letters apart in the word.
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