Connect all the squares together into a sequence, so that every square's arrow points towards the square that follows it (though the next square can be any distance away in that direction).
Left-drag from a square to the square that should follow it, or right-drag from a square to the square that should precede it.
Left-drag a square off the grid to break all links to it. Right-drag a square off the grid to break all links to it and everything else in its connected chain.
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