(;GM[1]FF[4]SZ[19]
GN[Approach]
PC[http://senseis.xmp.net/?ReductionTechniques]AP[GoWiki:2009]
DT[2013-03-31]
C[Diagram from http://senseis.xmp.net/?ReductionTechniques

Approach]
PL[W]

AB[di]
CR[bi][ci][bj][cj][ej][dk][ek]

;W[ck]C[W1]MN[1]

;CR[bi][ci][bj][cj][ej][dk][ek]
)
