20     1   *** begin left orientated grid enclosure    1
    24     1
    24     3
    25     3
    25     4
    29     4
    29     5
    31     5
    31     6
    32     6
    32     7
    33     7
    33    13
    31    13
    31    14
    29    14
    29    15
    26    15
    26    16
    24    16
    24    17
    15    17
    15    18
    11    18
    11    17
     7    17
     7    16
     5    16
     5    15
     2    15
     2    14
     1    14
     1     8
     2     8
     2     7
     5     7
     5     6
     7     6
     7     5
     9     5
     9     4
    12     4
    12     3
    15     3
    15     2
    20     2
    20     1   *** end left orientated grid enclosure   1