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: Plants release oxygen during the day but not during the night. 
Fact 2: Oxygen fatigue is a shortage of oxygen reaching the brain.

Output: Plants can reduce fatigue during the daytime.


Input: Consider Input: Fact 1: a prism is used for refracting light. 
Fact 2: Refraction is the bending of a ray of light.

Output: A prism can be used to bend a ray of light.


Input: Consider Input: Fact 1: Condoms can break; Condoms can be used incorrectly. 
Fact 2: Condoms make sex much safer, but there is still risk if the condom slips or breaks.


Output: Condoms make sex safe if they're not used incorrectly.