92o23g a3o2 b3o23 c3o23g d3o2
ytp2 ztp23 0tp23g 1tp2 2tp23
nkq23 okq23g pkq2 qkq23 rkq23g
cbr23g dbr2 ebr23 fbr23g gbr2
11r2 21r23 31r23g 41r2 51r23