type foo = (int, int) big_map

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): int option = 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 in
  Big_map.update 42 (get(bar)) n