import { type List } from "https://deno.land/x/ts_toolbelt_unofficial@1.1.0/mod.ts";
const { Concat } = List;
Attach L1
at the end of L
import { type List } from "https://deno.land/x/ts_toolbelt_unofficial@1.1.0/mod.ts";
const { Concat } = List;
Attach L1
at the end of L