nvn [ [ nvn
P XFOO XFPT XFRO XFST
Q POFOO POFPT POFRO POFST
3 PPFOO PPFPT PPFRO PPFST
S PRFOO PRFPT PRFRO PRFST
T PTFRO PTFST PUFOO PUFPT
U PUFRO PUFST PVFOO PVFPT