1. Give brief English sentence descriptions of the following sets: a) {2,4,6,8,} b) {,3,1,1,3,} c) {n:n=2m for some mN} d) {n:n=2m for some mN, and n=5k for some kN} e) {w:w is string over ={0,1} and w=wR} f) {n:n is an integer and n=n+1}