import { combineMonoid } from "https://deno.land/x/willow@0.2.1/src/store/storage/summarisable_storage/lifting_monoid.ts";
Combine two lifting monoids into a new one.
Parameters
a: LiftingMonoid<V, AL>
b: LiftingMonoid<V, BL>
Returns
LiftingMonoid<V, [AL, BL]>