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: Pressure receptors are found mainly in the skin. 
Fact 2: Skin is the body's largest organ.
Example Output: Pressure receptors are found mainly in the body's largest organ.

Example Input: Fact 1: when a river floods , that river deposits soil in flood plains. 
Fact 2: Soil erosion harms farm and grazing lands and increases flooding and desertification.
Example Output: When a river floods, that river harms farm and grazing lands.

Example Input: Fact 1: hitting an object causes the particles in that object to vibrate. 
Fact 2: Lightening is attracted to metal objects.
Example Output:
When metal is hit, it causes the particles in the metal to vibrate.