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  Problem

  How to generate block subscripts?
 
       0  1  2  9 10 11 18 19 20
       3  4  5 12 13 14 21 22 23
       6  7  8 15 16 17 24 25 26 

      27 28 29 36 37 38 45 46 47
      30 31 32 39 40 41 48 49 50
      33 34 35 42 43 44 51 52 53

      54 55 56 63 64 65 72 73 74
      57 58 59 66 67 68 75 76 77
      60 61 62 69 70 71 78 79 80 

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