Select only pair element in a list

hello, does anybody know how to sort a list with only pair point in a list, and only impair point in an other list ? I want to create a line with the first pair point of the list A and the first pair point of the list B… ( A1pair;B1pair - A1impair, B1impair…)
maybe with a cull ? or with a sorting list ?
I’m starting on grasshopper, thank you for your help

look for the Dispatch component

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