sqlite> SELECT COUNT(*) cnt, requires FROM prereq WHERE requires NOT IN (SELECT module FROM modules WHERE dist=0) GROUP BY requires ORDER BY cnt DESC LIMIT 10; 4324|Test::More 556|File::Spec 399|Scalar::Util 385|Test::Pod 380|LWP::UserAgent 310|DBI 292|URI 291|version 284|Test::Exception 276|Test::Pod::Coverage