Anchor: Soon, four boys took up their west flank, sticks in hand, marching as they passed.
Entailed: Four boys marched with sticks in hand.
Contradiction: The boys are empty-handed. 
Contradiction: A woman is fishing from a small rowboat in the pond.
Contradiction: The little boy is outside with a cat.
Contradiction: The man is sleeping on the train.
Contradiction: The hockey players are playing with a puck.