find the repeating numbers in order
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I want to find the repeating numbers from the array in order. I have tried different repeating functions which tell me the frequency of the numbers, but I want to know the order of the repeating numbers. For example I have an array which is a=[1,1,1,1,1,2,2,2,2,2,1,1,1,1,4,4,4,5,5,5,7,7,2,2,2,2] and I want my function to give me the answer 1,2,1,4,5,7,2.