Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Ex Input:
The seven unique crystal types are defined by faces parts of themselves (parts that intersect at various angles).

Ex Output:
The seven unique crystal types are defined by what parts of themselves (parts that intersect at various angles)?

Ex Input:
In a carbon triple bond, three pairs of electrons are shared.

Ex Output:
In a carbon triple bond, how many pairs of electrons are shared?

Ex Input:
A covalent network solid is a compound in which all of the atoms are connected to one another by covalent bonds.

Ex Output:
What is a compound in which all of the atoms are connected to one another by covalent bonds?