question: What has the U.S Department of Agriculture done to help watch for the snakes ?
answer: has trained detector dogs to keep the snakes out of the island 's cargo flow
turker_answer: To help watch for the snakes , the U.S Department of Agriculture has has trained detector dogs to keep the snakes out of the island 's cargo flow .
rule-based: The U.S Department of Agriculture has has trained detector dogs to keep the snakes out of the island 's cargo flow to help watch for the snakes .