def left
import bendtorch-core@0.1.0.0/src/storage/array.bend as Arrayimport Base
import bendtorch-core@0.1.0.0/src/storage/model.bend as Model
4def left(-T: Type, -d: Nat, -xs: Array<T>, -ys: Array<T>,
5 e: Model.Balanced(T, d, xs) & Model.Balanced(T, d, ys)) -> Model.Balanced(T, d, xs):
6 (ex, ey) = e
7 ex