Doc's EXTREME Daily Sudoku
14 December 2021
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XY Wing
W wing
W wing
Empty rectangle (hinge)
Empty rectangle (hinge)
Discontinuous Nice Loop
Grouped discontinuous nice loop
Discontinuous Nice Loop
Nice Loop
Discontinuous Nice Loop
Empty rectangle (hinge)
Finned X wing
A.I.C
XY Wing
XY Wing
W wing
W wing
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