(;GM[1]FF[4]SZ[19]
GN[Introduction]
PC[http://senseis.xmp.net/?BeginnerExercise5/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?BeginnerExercise5/Solution

Introduction]
PL[B]

AB[ob][nc][pc][pd][qd][rd][sd]
AW[pa][sa][pb][qb][qc][rc][sc]
CR[oa]


;CR[oa]
)
