(;GM[1]FF[4]SZ[19]
GN[Example 3: closed corridor of length 4]
PC[https://senseis.xmp.net/?Corridor]AP[GoWiki:2009]
DT[2019-12-22]
C[Diagram from https://senseis.xmp.net/?Corridor

Example 3: closed corridor of length 4]
PL[B]

AB[gi][hi][ii][ji][ki][gj][gk][hk][ik][jk][kk]
AW[li][lj][lk]
LB[kj:a]


;LB[kj:a]
)
