(;GM[1]FF[4]SZ[3]
GN[Twisted four (1)]
PC[http://senseis.xmp.net/?ConstructionProblem3/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?ConstructionProblem3/Solution

Twisted four (1)]
PL[W]

AW[ba][ab][bb][ac]


;
)
