premise: Two men are working together to empty the barrel of its contents. hypothesis: Two men are emptying a barrel.
entailment: "Empty the barrel" is a rephrase of "emptying a barrel.".|entailment: Two men working together are a type of two men, and emptying a barrel is a paraphrase of to empty the barrel.|entailment: Two men are working together to empty the barrel so they are  emptying a barrel.