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 watch is used for measuring time. 
Fact 2: Commute time is one measure.
Example Output: A watch can be used to measure your commute.

Example Input: Fact 1: the number of rings in a tree trunk can be used to estimate the age of the tree. 
Fact 2: If you want to find the age of a forest, you find the tree with the highest number of tree rings.
Example Output: to estimate the age of a forest, find the tree with the highest number of rings.

Example Input: Fact 1: Adolescence is a time of significant mental, emotional, and social changes. 
Fact 2: Adolescents One in every five people in the world is an adolescent.
Example Output:
at least one in every five people in the world is in a time of significant mental, emotional and social changes.