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Yesterday I did a last minute interview with a firm, although had two offers declining today (Tuesday). I liked the interviewer, but didn't really "click enough" to call one of the firms for an extension. Since I was meh about it, I went ahead accepted one of the two firms. This evening I received a callback from the interviewer. Since it's so late in the game, I was wondering the protocol for declining a callback.

"Thank you for your consideration, however I have decided to pursue another opportunity."

/thread.