premise: The Dr. Samuel D. Mercer House was built in 1885 at 3920 Cuming Street in the historic Walnut Hill neighborhood of Omaha, Nebraska, United States. Samuel Mercer was the chief surgeon of the Union Pacific Railroad, and the founder of Omaha's first hospital.
hypothesis: Construction of the Mercer house involved people who build things.
reason: Construction of the house necessarily involved people who built things because the house was built. Maybe I threw the AI a curve with the word "construction".