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: adding salt to a liquid decreases the melting point of that liquid. 
Fact 2: A low melting point will lower the heat needed.

Output: adding salt to a liquid lowers the heat needed to melt it.


Input: Consider Input: Fact 1: a calculator is used for adding. 
Fact 2: Calculator performs basic arithmetic, such as addition and subtraction.

Output: arithmetic includes uses for subtraction.


Input: Consider Input: Fact 1: a thermometer is used to measure temperature. 
Fact 2: When the temperature rises, the mercury expands and rises in the thermometer tube.


Output: Mercury expanding and rising in a tube is used to measure temperature.