(;GM[1]FF[4]SZ[6]
GN[Opposit set of first region (R.clone().xor(F))]
PC[http://senseis.xmp.net/?BinMatrix]AP[GoWiki:2009]
DT[2012-08-19]
C[Diagram from http://senseis.xmp.net/?BinMatrix

Opposit set of first region (R.clone().xor(F))]
PL[B]

CR[ba][ab][cf][ff]


;CR[ba][ab][cf][ff]
)
