Prove that each of the following sets is equinumerous with N by defining $(1)$ either an injection

from the given set to N or a surjection from N to the given set, and $(2)$ either injection from N to

the given set, or a surjection from the given set to N$.$ Implement the functions you define, in

Python or another programming language.

$13.$ N $\backslash$cup $\{(1,1)\}$

$14.$ N $\backslash$cup $\{(1,1),...,(1,20)\}$

$15.$ Z

$16.$ N $\backslash$times N

$17.$ N $\backslash$times N $\backslash$times N

$18.$ Q

$19.$ The set of all finite strings of ascii characters.