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function fun(n, k) {
  console.log(k)
  return {
    fun: function (m) {
      return fun(m, n)
    },
  }
}
var a = fun(0)
a.fun(1) //  undefined
a.fun(2) //  0
a.fun(3) //  0
var b = fun(0).fun(1).fun(2).fun(3)
var c = fun(0).fun(1)
c.fun(2) //
c.fun(3) //
