Consider the following program:

$cl(N,-1)$:$-N>0.$

$cl(N,$ outch $)$:$-N=$:$=0.$

$cl(N,1)$:

Question $1$: What is the value of $N$ for each of the following queries?

a$)?-Cl(1,N).$

b$)?-cl(0,N).$

c$)?-Cl(-1,N).$

Question $2$: Rewrite this program to make it more efficient.