nvn [ [ nvn
P WFRO WFST XFOO XFPT
Q XFRO XFST XFTO POFOT
3 POFPT POFRO POFRT POFTO
S PPFOO PPFPT PRFOO PRFPT
T PRFRO PRFST PTFOO PTFPT
U PTFQO PTFRT PTFST PUFOO
V PUFOT PUFQO PUFRO PUFST
W PUFTO PVFOT PVFPT PVFRO