Anchor: Taking a degree of writer's license, the alternative is to leave them in the postal system, sort them first, transport them immediately, and deliver them.
Entailed: the alternative is to leave them in the postal system then transport them immediately. 
Contradiction: the firsts choice is to leave them in the postal system then transport them immediately. 
Contradiction: We have been threated so we are going to kill them.
Contradiction: We have a paper mill that's only sixty miles away, in northern Vermont.
Contradiction: He asked me to leave the place.
Contradiction: Children are walking.