1.)Combination of lower and capital case like a,A

2.)starting backwards with ZZ

mainc B 0saved ye yf yg include 3 5 Output all two-letter .com Internet domain names */ yk int main(void) ( char letter1; 6 7 char letten2; 9 printf("Two-letter domain names: In"): yn. yo. . Yg- yr. ys. 9 printf("Two-letter domain names:In") 18 letter1 a while (letter1