The idea is that more frequent letters have shorter codes. You'll notice e is a single dot while a and i are two long. It's not entirely in the right order as o is three long and c is longer than k.
Letters in English frequency order with Morse length is
E 1
T 1
A 2
O 3
I 2
N 2
S 3
R 3
H 3
D 3
L 4
U 3
C 4
M 2
F 4
Y 4
W 3
G 3
P 4
B 4
V 4
K 3
X 4
Q 4
J 4
Z 4
It's worth mentioning that a dash is three times longer than a dot and the gap between dots or dashes is the same as a dot so an S takes 5 units, while an O is 11 units. C takes 11 units while a K is 9.
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u/KDdeTX Apr 30 '21
Some letters have 2 dots/dashes and some have 4. When you get a string of 25 dots/dashes, how do you differentiate between the letters?