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## Example 1
## arrItem_01 = [[1, 1], [2, 1], [3, 2]]
## arrItem_02 = [[2, 2], [1, 3]]
## Example 2
## arrItem_01 = [[1, 2], [2, 3], [1, 3], [3, 2]]
## arrItem_02 = [[3, 1], [1, 3]]
## Example 3
arrItem_01 = [[1, 1], [2, 2], [3, 3]]
arrItem_02 = [[2, 3], [2, 4]]
arrCombine = arrItem_01 + arrItem_02
arrUniq = set([arrLoop[0] for arrLoop in arrCombine])
arrOutput = [[elemLoop, sum([arrLoop[1] for arrLoop in arrCombine if arrLoop[0] == elemLoop])] for elemLoop in arrUniq]
print (arrOutput)
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