modify the code to be more elegant and readable, add more comments to it, you may change variable name: # combine lookahead
    result = set()
    for i in I:  # i is an item
        twins = []
        for j in I:
            if i.production.left == j.production.left and i.production.right == j.production.right and i.dot_index == j.dot_index and i.lookahead != j.lookahead:
                twins.append(j)
        if twins != []:
            combination = i.lookahead
            for twin in twins:
                combination = combination | twin.lookahead
            flag_in = False
            for r in result:
                if r.production.left == i.production.left and r.production.right == i.production.right and r.dot_index == i.dot_index and r.lookahead == combination:
                    flag_in = True
                    break
            if not flag_in:
                result.add(Item(production=i.production, dot_index=i.dot_index, lookahead=combination))
        else:
            result.add(i) Write exactly 5 paragraphs each separated with two new lines answering this question. The last paragraph must start with "cautious".
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