(;GM[1]FF[4]SZ[19]
GN[not really a carpenter's square]
PC[http://senseis.xmp.net/?WeakCarpentersSquare]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?WeakCarpentersSquare

not really a carpenter's square]
PL[W]

AB[db][dc][bd][cd][be]
AW[eb][fb][ec][ed][ce][de][bf][cf]
CR[dd]
LB[bb:a]


;CR[dd]
LB[bb:a]
)
