{1,2, ..., 99}, P(x) 
S(x).1. The truth set for the predicate P(x) is all the values of x in the domain which make the predicate true.
The truth set for P(x) is {10, 20, 30, 40, 50, 60, 70, 80, 90}.
The truth set for S(x) is {5, 10, 15, 20, 25, ..., 85, 90, 95}.
Since every value which is in the truth set for P(x) is also in the truth
set for S(x) we can say that "For all x in the domain, if P(x) is true then S(x) is
also true." Symbolically this can be represented as " x {1,2, ..., 99}, P(x) S(x).