class Solution(object):
    def removeDuplicates(self, nums):
        """
        :type nums: List[int]
        :rtype: int
        """
        isSecond = False
        ele = -1
        arr = nums
        itemsTobeRemoved = []
        for i in arr:
            if ele != i:
                isSecond = False
                ele = i
            elif not isSecond:
                isSecond = True
            else:
                itemsTobeRemoved.append(i)
        for item in itemsTobeRemoved:
            arr.remove(item)
        return arr
if __name__ == '__main__':
	print Solution().removeDuplicates([1, 1, 1, 2, 3, 3, 3, 4, 4, 4])

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