4 5

   0 011111000000000000000???
   1 100000111000000000000???
   2 100000000111000000000???
   3 100000000000111000000???
   4 100000000000000111000???
   5 100000000000000000111???
   6 010000000???????????????
   7 010000000???????????????
   8 010000000???????????????
   9 001000???000????????????
  10 001000???000????????????
  11 001000???000????????????
  12 000100??????000?????????
  13 000100??????000?????????
  14 000100??????000?????????
  15 000010?????????000??????
  16 000010?????????000??????
  17 000010?????????000??????
  18 000001????????????000???
  19 000001????????????000???
  20 000001????????????000???
  21 ?????????????????????0??
  22 ??????????????????????0?
  23 ???????????????????????0