yul0
zul0p
0ul0pq
1ul0
2ul0p
nlm0p
olm0pq
plm0
qlm0p
rlm0pq
ccn0pq
dcn0
ecn0p
fcn0pq
gcn0
12n0
22n0p
32n0pq
42n0
52n0p
qto0p
rto0pq
sto0
tto0p
uto0pq