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: using a gasoline engine requires burning gasoline. 
Fact 2: Gasoline and flammable liquid related burns, however, are a preventable problem.
Example Output: using an engine requires burning flammable liquid.

Example Input: Fact 1: condensation is when change from a gas into a liquid by reducing heat energy. 
Fact 2: Heat is kinetic energy.
Example Output: condensation is when change from a gas into a liquid by reducing kinetic energy.

Example Input: Fact 1: microscope is used to see small things by biologists by making them appear bigger. 
Fact 2: Bacteria are too small to be seen without a microscope.
Example Output:
Biologists need a microscope to make bacteria appear bigger.

