type ** : Type -> Type -> Type

var a < c

var {a}: c -> d

class Monad < Type -> Type

type (a : Monad) t := t -> t

free type Term ::= Var Variable | Lam Variable Term | App Term Term

type WNet={(sys,i,o): T * T * T . i = o }

var a+ : Type

var - : Type

var []+ : Type

op a:? b

op a: ? b