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: Lancelet larvae are free-swimming. 
Fact 2: Some types of snails are free swimming, while others are sessile.
Example Output: lancelet larvae are not sessile.

Example Input: Fact 1: a laser is used for producing light. 
Fact 2: Light contains energy.
Example Output: A laser is used for producing energy.

Example Input: Fact 1: if an object is black then that object absorbs all visible light. 
Fact 2: Light seems to travel in rays or beams.
Example Output:
black objects absorb all visible rays or beams.