Q$20.$ Suppose a computer program has been initialized such that the following sets have been stored for use in any algorithm:

A $=\{1,2,3,...,40\}$

B $=\{-7,-6,-5,...,30\}$

Consider the following algorithm, which represents one part of the whole computer program $($comments may occur after the # symbol on any line and are not used in computations$)$: