type foo = big_map(int, int);

let set_ = (n: int, m: foo): foo => Big_map.update(23, Some(n), m);

let rm = (m: foo): foo => Big_map.remove(42, m);

let gf = (m: foo): int => Big_map.find(23, m);

let get = (m: foo): option(int) => Big_map.find_opt(42, m);

let empty_map: foo = Big_map.empty;

let map1: foo = Big_map.literal([(23, 0), (42, 0)]);

let map1: foo = Big_map.literal([(23, 0), (42, 0)]);

let mutimaps = (m: foo, n: foo): foo => {
  let bar: foo = Big_map.update(42, Some(0), m);
  Big_map.update(42, get(bar), n);
};