(;GM[1]FF[4]SZ[19]
GN[Symmetry, indeed.]
PC[http://senseis.xmp.net/?BeginnerExercise234/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?BeginnerExercise234/Solution

Symmetry, indeed.]
PL[B]

AB[ih][jh][kh][hi][ji][li][hj][jj][lj]
AW[ig][jg][kg][gh][hh][lh][mh][gi][mi][gj][mj][gk][mk][hl][il][jl][kl][ll]
LB[ij:a][kj:b][ik:a][kk:b]

;B[jk]C[B1]MN[1]

;LB[ij:a][kj:b][ik:a][kk:b]
)
