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Answer
Figure This!
 

Quick Answer:

The most commonly used consonants after those listed are D, H and C.

The next most common vowels are I and A.

You might choose your set of letters from these.

 

Complete Solution:

The frequency of each letter can vary, depending on the sample. In English, E and T occur the most frequently.

The table below shows the number of times each letter occurred in one sample of 1000 letters. In this sample, the letters D and H appear most frequently after those already given, and one of these might be a good choice.

 
A
B
C
D
E
F
G
H
I
J
K
L
M

73

9

30

44

130

28

16

35

74

2

3

35

25

N
O
P
Q
R
S
T
U
V
W
X
Y
Z

78

74

27

3

77

63

93

27

13

16

5

19

1

Source: Sinkov, A. Elementary Cryptanalysis. Washington, DC: Mathematical Association of America, 1968.

 

 

 

Choose H, D, C and either I or O. If I is chosen, then the letters you see are:

                 
 
I
C
H
E
L
 
 

R

D

N

 
 
                 


A possible answer is Michael Jordan.

 
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