Gomūtrikā

The ox's trail, zigzagging as it goes: three bends, four samayas, three without intake. The longest passage there is; 2.29 says fewer than four bends, and this is the last shape before that line. It needs the loka's own corners to happen at all.

On the lattice the path is drawn as the bhāṣya names it; the other three are beside it, so the four shapes can be read as one rule: a bend is a samaya, and a samaya on a bend takes nothing in.