Pagination for feeds is currently only done as an offset in the content api query via the from parameter. Using an offset means that if there are other articles published between the initial load and the page forward/backward, you will see a duplicate story. Using the timestamp of the last loaded story means that we can avoid the duplicates regardless of how many stories had been published. Right now, we can reuse the from parameter for paginating forward in this way, but there isn't a corresponding parameter for paginating backward.
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