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Amazon.com: Tap Code: The Epic Survival Tale of a Vietnam POW and the Secret Code That Changed Everything: 9780310359111: Harris, Carlyle S., Berry, Sara W., Col. Lee Ellis (Ret.): Books
SGWEN - VII ème Caire - Roman Alphabet Tap Code The tap code is a way to encode text messages on a letter-by-letter basis by transmitting a series of tap (knock) sounds.
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