How do I interpret this divide and conquer algorithm for removing duplicates in a list?

cs.stackexchange https://cs.stackexchange.com/questions/54827

Question

Consider the following divide and conquer algorithm to remove duplicates in a list. The text is in French.

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What is the meaning of the variables $c1, c2, d1, d2$? Why are only the variables $c1, d1$ compared?

No correct solution

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