Lāṅgalikā

The plough: out, along, and up again, two bends, three samayas, two of them without intake. The commentators reach this shape when the next body lies off both of the soul's rows at once.

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.