The non-unique array (check for duplications)

of

Random Numbers

between

2 and 9

(array length) - --

  0   1   2   3   4   5   6   7  
  8   9   10 11 12 13 14 15
  16 17 18 19 20 21 22 23
  24 25 26 27 28 29 30 31
  32 33 34 35 36 37 38 39