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let signature S = (n : Nat) -> Set
let signature U = (k : Bool) -> S
let signature W = (k : Bool)(n : Nat) -> Set

let instance u :: U = for (k : Bool), for (n : Nat), (Nat :: Set)
let instance w :: W = u

let signature F = (n : Nat) (m : Nat) -> Set
let signature G = (n : Nat) -> (m : Nat) -> Set

let instance f :: F = for (n : Nat) (m : Nat), (Nat :: Set)
let instance g :: G = f