(;GM[1]FF[4]SZ[21]
GN[21x21 diagram]
PC[https://senseis.xmp.net/?21x21]AP[GoWiki:2009]
DT[2022-03-30]
C[Diagram from https://senseis.xmp.net/?21x21

21x21 diagram]
PL[B]



;
)
