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\# Before:
\# topcell -> a -> b -> c -> d
\# topcell -> b -> c -> d
\# topcell -> c -> d 

\# After:
\# topcell

下面的code保存为flatten.txt. 执行calibredrv flatten.txt

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set lay [layout create "abcd.gds" -dt_expand \
-preservePaths -preserveTextAttributes]
set topcell [$lay topcell]
$lay flatten cell $topcell
$lay gdsout out.gds