question: What is reinvent the toilet trying to develop
answer: The Reinvent the Toilet Challenge is a long-term research and development effort to develop a hygienic , stand-alone toilet
turker_answer: The Reinvent the Toilet Challenge is a long-term research and development effort trying to develop a hygienic , stand-alone toilet .
rule-based: The Reinvent the Toilet Challenge is a long-term research and development effort to develop a hygienic , stand-alone toilet is reinvent the toilet trying to develop