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 black hole is formed by a high-mass star collapses. 
Fact 2: Fundamentally, a black hole is invisible.
Example Output: a star collapsing can be invisible.

Example Input: Fact 1: coal is used for generating heat by burning. 
Fact 2: Thus, the food is cooked by heat generated internally.
Example Output: coal can be used to cook food.

Example Input: Fact 1: Bioterrorism is the intentional release or spread of agents of disease. 
Fact 2: Variola major, the virus that causes smallpox, is considered a potential bioterrorism agent.
Example Output:
The intentional release of smallpox is considered bioterrorism.