The greatest common divisor (GCD) of two numbers a and b is defined as follows: If a > b, then (gcd a b) is gcd of a - b and b. Else, if a

1. Define a function gcd that computes the GCD according to the definition given here.

The following interaction log illustrates the function:

2. Use the function gcd to define GCDs that takes two lists of numbers and produces a third list that contains the list of GCDs of corresponding elements from the first and the second list. The following interaction log illustrates the function: