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Idea

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CW code (Morse)

Complete table with alphabet, digits and useful punctuation.

CharacterCodeCharacterCode
A.-N-.
B-...O---
C-.-.P.--.
D-..Q--.-
E.R.-.
F..-.S...
G--.T-
H....U..-
I..V...-
J.---W.--
K-.-X-..-
L.-..Y-.--
M--Z--..
1.----6-....
2..---7--...
3...--8---..
4....-9----.
5.....0-----
..-.-.-,--..--
?..--../-..-.
=-...-+.-.-.

Prosigns

ProsignsCodeUsage
AR.-.-.End of message
SK...-.-End of contact
BT-...-Separator
AS.-...Wait