it (just) so happens (that)
Surprisingly or by an unlikely coincidence. You're looking for a room to rent this winter? Well, it so happens I've been looking for someone to sublet my room! It just so happens that we'll be in the Bahamas then. A: "Well, it just so happens I have an extra copy of Pride and Prejudice you can borrow." B: "Seriously? Oh, thank you, thank you!"
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