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#!/usr/bin/perl

...
This is perl 5, version 38, subversion 0 (v5.38.0) built for x86_64-li
+nux-thread-multi

END

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aabadcaa
(?^:^((a*)b|a*b?d)*c\2$)
...
No

This is perl 5, version 38, subversion 0 (v5.38.0) built for x86_64-li
+nux-thread-multi