Puzzle 24 / Double Back

Right, back to puzzles because I have nothing substantial to say. Circumstantial evidence suggests I created this one in June.

This is one of a bunch of MellowMelon’s Double Backs. Draw a closed loop through all square centers visiting each bold-outlined area twice.

EDIT 2012/10/12 UTC+8 7:30 PM: Fixed (or should I say rewrote) the top right quadrant and bottom middle. I hope.

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