[TokicMajstor]

Код:

new RandomLetters[5][2]=
{
    "a","b","c","d","e"//..........
}



new code[20];
code[0] = random(RandomLetters[5]);
code[1] = random(9);

This will make first character of the code to random letter (you need to add all the alphabet to letters), and second character to random number from 0 to 9.

Iam not sure is this all OK, so send me errors or problems