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.

Input: Consider Input: Fact 1: fluoride decreases tooth decay. 
Fact 2: Humans get most of their fluoride in drinking water.

Output: Drinking water decreases tooth decay.


Input: Consider Input: Fact 1: Insects may live in large colonies and have complex social behaviors. 
Fact 2: Ants are social insects living in colonies.

Output: Ants have complex social behavior.


Input: Consider Input: Fact 1: braking can cause skidding. 
Fact 2: Race cars have brakes.


Output: race cars can skid.