{                                  'segment 1: cube 1
0FTR,1FT,2F,3F,-1,      'face 1 to the front with vertices 0 and 1 to the top, vertex 0 to the right
4,5,6,7,-1,
0,1,5,4,-1,
1,2,6,5,-1,
2,3,7,6,-1,
3,0,4,7,-1,
}                                 ' end of segment 1
{                                 'segment 2: cube 2
0FTR,1FT,2F,3F,-1,     'same orientation as cube 1
4,5,6,7,-1,
0,1,5,4,-1,
1,2,6,5,-1,
2,3,7,6,-1,
3,0,4,7,-1,
}                                ' end of segment 2
[                                 'inter-realm links from here
1,2,-2,                         'definition link:  vertex 1 is in segment 1, vertex 2 is in segment 2.

0,0,-1,                         'inter-realm line:   link vertex 0 (in segment 1) to vertex 0 (in segment 2)
1,1,-1,
2,2,-1,
3,3,-1,
2,1,-2,                         'definition link:  vertex 1 is in segment 2, vertex 2 is in segment 1. (doesn't make any difference but is included as an example)
4,4,-1,                         'inter-realm line:   link vertex 4 (in segment 2) to vertex 4 (in segment 1)
5,5,-1,
6,6,-1,
7,7,-1,
]                                'end of realm links

