The vectors of a context: the length of the vector from the region of each discourse atom to
each referent, and the cut-offs r₋ₙ of the lengths, r₋₀ the maximal length for NEAR to
apply.
- length : Finset Discourse.Role → E → D
- cut : ℕ → D
Used by Vectors.Near, instDecidableNear, Vectors.near_of_length_le, DeicticTerm.Locates, instDecidableLocates, locates_iff_presup, config