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2.6
曲
げる
(2)
\fbox{
\xymatrix@=5pt{
\bullet
\ar@{-}
‘d[dr]
’[rrrd]
‘[rrrr]
[rrrr]
&
&
\bullet
\ar@{-}
’[d]
[dd]
\ar@{-}[rrdd]
&
&
\bullet
\\
&
&
&
&
\\
\bullet
\ar@{-}
‘r[ruu]
’[ru]
‘[rruu]
[rruu]
&
&
\bullet
&
&
\bullet
}
}
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