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: a speedometer is used for giving a driver feedback on the speed of their vehicle. 
Fact 2: Speed is the magnitude of velocity.

Output: A speedometer is used for giving feedback on the velocity of a vehicle.


Input: Consider Input: Fact 1: breaking apart rocks can cause debris. 
Fact 2: Sledge hammers can be used to break especially hard ledges of rock.

Output: hammers can cause debris.


Input: Consider Input: Fact 1: Steroid hormones are made of lipids, such as phospholipids and cholesterol. 
Fact 2: Steroids Steroids are lipids and, more specifically, derivatives of cholesterol.


Output: steroids are derivatives of cholesterol.