A mixed alphabet cubic analogues of the Polybius Square is drawn up.
Layer I
1 2 3
1 F J O
2 R X C
3 Y B S
Layer II
1 2 3
1 V Z L
2 G D P
3 M W T
Layer III
1 2 3
1 E U Q
2 N H A
3 . K I
OR:
F-111
R-112
Y-113
J-121
X-122
B-123
O-131
C-132
S-133
V-211
G-212
M-213
Z-221
D-222
W-223
L-231
P-232
T-233
E-311
N-312
.-313
U-321
H-322
K-323
Q-331
A-332
I-333
