code: def single_number2(nums):
      ones, twos = 0, 0
      for i in range(len(nums)):
          ones = (ones ^ nums[i]) & ~twos
          twos = (twos ^ nums[i]) & ~ones
      return ones
  
label_desc: Use image node_id 1 for calling a global function with example usage: single_number2(nums) and returns: ones