These are the different sections:
a I q y 1 9
b j r z 2
c k s 3
d l t 4
e m u 5
f n v 6
g o w _ 7
h p x 0 8
Usually, F N V 6 is searched most often and C K S 3 is searched the least often. So basically, if you want to be a successful shop owner, your username should start with a F, N, V or 6!