def draw_fin
import bend-collections-laws-math@1.0.0.0/src/math/random/rand.bend as Randimport Base
import bend-collections-laws-math@1.0.0.0/src/math/u64.bend as W
111def draw_fin(-S: Data, s: S, p: W.U64 & W.U64) -> Draw<S>:
112 (lo, hi) = p
113 D{hi, lo, s}