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This is a list of known shapes that have interchangeable pieces, allowing for flexibility in building setups.
Dimension format is: Width x Height
2 Piece Setups
LJ Horizontal Arm
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LJ Vertical Arm
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JT and LT
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JT and LT
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JT and LT
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Chiptooth/Hearts
JZ/ZJ and LS/SL
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JO/OJ and LO/OL
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3 Piece Setups
3x4 Boxes
JOL and LOJ
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JJO, LLO, OJJ, and OLL
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JZJ and LSL
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, , JSL, and LZJ
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TTJ and TTL
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IOO and OOI
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4x3 Boxes
OLJ and LJO
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OJJ and OLL
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JZJ and LSL
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JZL and LSJ
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TTJ and TTL
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IOO and OOI
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LJO Spiral
Shifted Box
IJL H
LJZ Setup
OSZ Ball
OSZ Stairs
LSZ Stairs
Flat Top
LSZ Fin
ISZ Trapezoid
Bar
Tabs
LST Hill
ITL Boat
ITL Hand
LIJ Shelf
LIJ Bridge
4 Piece Setups
4x4 Boxes
Mushroom
Sheep
JSOL Wall
5 Piece Setups
Most setups this size or larger are highly redundant.
6 Piece Setups
Grace System