I'm browsing through ps23d wiki and it looks like a lot of PS2 formats use the same vertex/face storage where you just string a bunch of vertices together and those are the faces.
So for example, if I have a sequence of vertices
[0, 1, 2, 3, 4, 5, 6, ...]
Are the faces just
0 1 2
1 2 3
2 3 4
...
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