(;GM[1]FF[4]SZ[19]
GN[]
PC[http://senseis.xmp.net/?BeginnerExercise106/Solution]AP[GoWiki:2009]
DT[2014-01-15]
C[Diagram from http://senseis.xmp.net/?BeginnerExercise106/Solution

]
PL[B]

AB[da][bb][db][ac][bc][cc]
AW[ca][ea][eb][dc][ec][ad][bd][cd][dd]
LB[aa:b][ba:a][ab:b][cb:a]


;LB[aa:b][ba:a][ab:b][cb:a]
)
