Wumpus world sentences
Let Pi,j be true if there is a pit in [i, j].
Let Bi,j be true if there is a breeze in [i, j].
P1,1
B1,1
B2,1
n "Pits cause breezes in adjacent squares"
B1,1     (P1,2 P2,1)
B2,1     (P1,1 P2,2 P3,1)