(;GM[1]FF[4]SZ[19]
GN[Letter U shape]
PC[http://senseis.xmp.net/?SecondaryLibertiesExampleU]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?SecondaryLibertiesExampleU

Letter U shape]
PL[B]

AB[gf][if][fg][hg][jg][fh][jh][fi][ji][fj][jj][fk][jk][gl][hl][il]
AW[gg][ig][gh][ih][gi][ii][gj][ij][gk][hk][ik]
LB[hf:a]

;B[hh]C[B1]MN[1]
;B[hi]C[B3]MN[3]

;LB[hf:a]
)
