<https://example.com/s> <https://example.com/p1> <https://example.com/o1> <https://example.com/g> .
<https://example.com/s> <https://example.com/p1> <https://example.com/o2> <https://example.com/g> .
<https://example.com/s> <https://example.com/p2> <https://example.com/o3> <https://example.com/g> .