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_1 , var_2 , var_3 = 0 , 0 , 0
      for var_4 in var_0 :
          var_2 |= var_1 & var_4
          var_1 ^= var_4
          var_3 = var_1 & var_2
          var_1 &= ~ var_3
          var_2 &= ~ var_3
      return var_1
  