# Unigram
U01:%x[-1,0]
U02:%x[0,0]
U03:%x[1,0]
U05:%x[-1,0]/%x[0,0]
U06:%x[0,0]/%x[1,0]

U11:%x[-1,1]
U12:%x[0,1]
U13:%x[1,1]
U16:%x[-1,1]/%x[0,1]
U17:%x[0,1]/%x[1,1]

U20:%x[-1,0]/%x[0,0]/%x[1,0]
U21:%x[-1,1]/%x[0,1]/%x[1,1]

# Bigram
B