code: def tea_decipher(v, key):
      
      DELTA = 0x9e3779b9
      n = len(v)
      rounds = 6 + 52//n
      sum = (rounds*DELTA)
      y = v[0]
      while sum != 0:
          e = (sum >> 2) & 3
          for p in range(n-1, -1, -1):
              z = v[(n + p - 1) % n]
              v[p] = (v[p] - MX(z, y, sum, key, p, e)) & 0xffffffff
              y = v[p]
          sum -= DELTA
      return v
docs: Tiny Decryption Algorithm decription (TEA)
      See https://en.wikipedia.org/wiki/Tiny_Encryption_Algorithm