The answer for me its abc['A' ,'B','C',None], arrays start from 0 not 1 so, saying m[:2] means first 3 letters in lowercase abc and then n[:4] means 4 spaces in array, first 3 are A, B and C and theres no more so None at the end, i guess, im kind of confused now but i will go with that answer.
Noted! I will reveal the solution in the next installment. Keep and eye on it if you want.