Your Name
CS 4301
Lab 4
{x | x is in {a, b, c}+, and the number of a's plus the number of b's
     plus twice the number of c's is divisible by six}

Input:  aaaaaa *** valid input ***

Input:  bbbbbb *** valid input ***

Input:  ccc *** valid input ***

Input:  babac *** valid input ***

Input:  caabb *** valid input ***

Input:  bcbaa *** valid input ***

Input:  abcba *** valid input ***

Input:  ccaa *** valid input ***

Input:  cabc *** valid input ***

Input:  cccccc *** valid input ***

Input:  aacbbccc *** valid input ***

Input:  ccccccccc *** valid input ***

Input:  aaaaaaaaaaaabbbbbbbbbbbb *** valid input ***

Input:  aaabbb *** valid input ***

Input:   --- invalid input ---

Input:  a --- invalid input ---

Input:  b --- invalid input ---

Input:  aa --- invalid input ---

Input:  ab --- invalid input ---

Input:  ba --- invalid input ---

Input:  bb --- invalid input ---

Input:  aaa --- invalid input ---

Input:  bbb --- invalid input ---

Input:  abba --- invalid input ---

Input:  abcb --- invalid input ---

Input:  abbbbaa --- invalid input ---