Unique values of LITHCODE

Value	Number of Occurrences
n	15629
g	15502
s	14699
c	8375
v	7478
p	6194
d	5417
?	4207
	3383
w	3239
i	2900
b	2831
h	2290
j	1777
y	1665
x	1315
l	455
f	445
m	351
e	313
a	204
q	164
u	108
t	101
o	20
z	18