function coo(x) {
      let sec = arguments[1]
      const y = x || {}
      if (y.arr) y.arr.push(sec)
      if (!y.arr){
        y.arr = sec ? [sec] : []
      }

      return new Proxy(y, {
        get(a, b) {

          a.arr.reduce((hash, x) => {
            if (!hash[x]){
              hash[x] = {}
            }
            return hash[x]
          }, a)

          return coo(a, b)
        }
      })
    }