nvn [ [ nvn
P WFRO WFST XFOO XFPT
Q XFRO XFST POFOO POFPT
3 POFRO POFST PPFOO PPFPT
S PPFRO PPFST PRFOO PRFPT
T PRFRO PRFST PSFOO PSFPT
U PSFRO PSFST PTFOO PTFPT
V PTFRO PTFST PUFOO PUFPT
W PUFRO PUFST PVFOO PVFPT