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Tap Code 5×5 Square

The classic 5×5 Tap Code alphabet with row/column coordinates; I and J share a square.

Row ↓ / Col →12345
1ABCDE
2FGHIK
3LMNOP
4QRSTU
5VWXYZ
First group of taps = row, second group = column. Example: C = 13 (one tap then three), A = 11, T = 44. I/J both use 24.
Geocaching tip: Count the taps in each group separately; pauses distinguish row from column. Some caches swap the order.