a =: 0 : 0
0  0  0  0  0  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  0  0  0  0  0
)
   $b =: ".;._2 a
6 7

>,each ;/(3&":`(' '"_))@.(0=])"0"1 b
                    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
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