comefrom: <qiyuangong>137_Single_Number_II_2.py
code: def singleNumber( nums):
      ones, twos, threes = 0, 0, 0
      for num in nums:
          twos |= ones & num
          ones ^= num
          threes = ones & twos
          ones &= ~threes
          twos &= ~threes
      return ones
masked: def sample_funcname ( var_0 ) :
      var_2 , var_3 , var_4 = 0 , 0 , 0
      for var_5 in var_0 :
          var_3 |= var_2 & var_5
          var_2 ^= var_5
          var_4 = var_2 & var_3
          var_2 &= ~ var_4
          var_3 &= ~ var_4
      return var_2
  