How many pairs of letters are their in the word castraphone?
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Looking into the alphabets there are six such pairs namely ON, HONE, ST, TRAPHO, TRAPHON, RAP.
1. ON - NO
2. HONE - EFGH
3. ST - ST
4. TRAPHO - OPQRST
5. TRAPHON - NOPQRST
6. RAP - PQR
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