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

Four space extensions]
PL[B]

AB[gc][lc][dh][ph][dm][qm]
CR[dh][dm]
SQ[ph][qm]


;CR[dh][dm]
SQ[ph][qm]
)
