#nexus
[This file provided by Paul Lewis, from the NCL test suite. ]

begin taxa;
  dimensions ntax=8;
  taxlabels taxon_1 taxon_2 taxon_3 taxon_4 taxon_5 taxon_6 taxon_7 taxon_8;
end;

[!
******************************************
* Interleaved, rectangular, no diagonals *
******************************************
]
begin distances;
  format interleave triangle=both;
  matrix
    taxon_1   0   1   2   3
    taxon_2   1   0   8   9
    taxon_3   2   3   0  14
    taxon_4   4   5   6   0
    taxon_5   7   8   9  10
    taxon_6  11  12  13  14
    taxon_7  16  17  18  19
    taxon_8  22  23  24  25

    taxon_1   4   5
    taxon_2  10  11
    taxon_3  15  16
    taxon_4  19  20
    taxon_5   0  23
    taxon_6  15   0
    taxon_7  20  21
    taxon_8  26  27

    taxon_1   6   7
    taxon_2  12  13
    taxon_3  17  18
    taxon_4  21  22
    taxon_5  24  25
    taxon_6  26  27
    taxon_7   0  28
    taxon_8  28   0;
end;