Combine the given two facts to write a concluding fact. Note that there should be some parts of the first and second facts that are not mentioned in this conclusion fact. Your combined fact should be the result of a chain between the two facts. Chains form when two facts connect together to produce a concluding fact. An example of a chain is: "pesticides cause pollution" (fact1) + "pollution can harm animals" (fact2) → "pesticides can harm animals" (conclusion fact). Parts of the concluding fact overlap with the first and the second fact. To construct such a  concluding fact, a useful way is to borrow the subject from one fact and the ending conclusions from another fact.

Example Input: Fact 1: Urine leaves the body through a sphincter in the process of urination. 
Fact 2: Fluids in the urine eliminate metabolic waste products.
Example Output: Metabolic waste products can leave the body through a sphincter.

Example Input: Fact 1: Viruses are not cells at all, so they are neither prokaryotes nor eukaryotes. 
Fact 2: Prokaryotes All bacteria are prokaryotes.
Example Output: viruses are not bacteria.

Example Input: Fact 1: a calculator is used for adding. 
Fact 2: Around 500 BC, the abacus, the first mechanical calculator, was developed.
Example Output:
an abacus is used for adding.