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: electricity sometimes is used for heating buildings. 
Fact 2: Nuclear fission is the only method currently used by nuclear plants to generate electricity.

Output: Nuclear fission can be used to heat buildings.


Input: Consider Input: Fact 1: Mollusks live in most terrestrial, freshwater, and marine habitats. 
Fact 2: Clams, oysters and snails are familiar mollusks.

Output: oysters live in most terrestrial, freshwater, and marine habitats.


Input: Consider Input: Fact 1: a human requires sleep to be healthy. 
Fact 2: Healthy lifestyles are good lifestyles to have.


Output: Humans require sleep to have good lifestyles.