What is the relationship between "All staples are fasteners" and "All non-fasteners are non-staples"?

Question

Quizplus · Accepted Answer

The statement "All staples are fasteners" can be written as "If X is a staple, then X is a fastener." 
The contrapositive of this statement is "If X is not a fastener, then X is not a staple." 
The statement "All non-fasteners are non-staples" can be written as "If X is a non-fastener, then X is a non-staple." 
This statement is equivalent to the contrapositive of the first statement, so the relationship between the two statements is contrapositive.

What Is the Relationship Between "All Staples Are Fasteners" and "All