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: a vehicle is used for transportation. 
Fact 2: All traffic vehicles are Air Planes.
Example Output: a plane is used for transportation.

Example Input: Fact 1: a barometer is used to measure air pressure. 
Fact 2: Uses Elemental mercury is used in thermometers, barometers, and pressure-sensing devices.
Example Output: Elemental mercury helps measure air pressure.

Example Input: Fact 1: an automobile engine transforms chemical energy into mechanical energy. 
Fact 2: Mechanical energy is the sum of Kinetic Energy and Potential Energy.
Example Output:
An automobile engine works by summing kinetic energy and potential energy.