join on OR chain (all left)
2	3
6	4
6	4
==
2	3
5	4
100	4
==
2	3	2	3
6	4	5	4
6	4	100	4
==
1
==
1	3
==
1	2	2	3
==
2	4
join on OR chain (all right)
2	3
6	4
6	4
==
2	3
5	4
100	4
==
2	3	2	3
6	4	5	4
6	4	100	4
==
0
1
==
0	4
1	3
==
0	0	6	4
1	2	2	3
==
2	4
6	5
join on OR chain (full)
2	3
6	4
6	4
==
2	3
5	4
100	4
==
2	3	2	3
6	4	5	4
6	4	100	4
==
0
1
==
0	4
1	3
==
0	0	6	4
1	2	2	3
==
2	4
6	5