Twin directories of flex:

[DIR]  ftp://128.31.0.36/debian-security/pool/updates/main/f/flex/
[DIR]  ftp://ftp.linux.it/ubuntu/pool/main/f/flex/
[DIR]  ftp://ftp.linux.it/debian/pool/main/f/flex/
[DIR]  ftp://134.121.1.1/.snapshot/nightly.3/pub/gnu/non-gnu/flex/
[DIR]  ftp://134.121.1.1/.snapshot/nightly.3/pub/gnu/flex/
[DIR]  ftp://134.121.1.1/pub/gnu.OLD/non-gnu/flex/
[DIR]  ftp://134.121.1.1/.snapshot/nightly.2/pub/gnu/flex/
[DIR]  ftp://134.121.1.1/.snapshot/nightly.2/pub/gnu/non-gnu/flex/
[DIR]  ftp://134.121.1.1/.snapshot/nightly.1/pub/gnu/non-gnu/flex/
[DIR]  ftp://134.121.1.1/.snapshot/nightly.1/pub/gnu/flex/
[DIR]  ftp://134.121.1.1/.snapshot/nightly.0/pub/gnu/non-gnu/flex/
[DIR]  ftp://134.121.1.1/.snapshot/nightly.0/pub/gnu/flex/
[DIR]  ftp://134.121.1.1/.snapshot/hourly.1/pub/gnu/non-gnu/flex/
[DIR]  ftp://134.121.1.1/.snapshot/hourly.1/pub/gnu/flex/
[DIR]  ftp://ftp.eutelia.it/pub/Slackware_Mirror/slackware-12.1/source/d/flex/
[DIR]  ftp://ftp.eutelia.it/pub/Slackware_Mirror/slackware-current/source/d/flex/
[DIR]  ftp://ftp.eutelia.it/pub/Slackware_Mirror/slackware-11.0/source/d/flex/
[DIR]  ftp://ftp.eutelia.it/pub/Slackware_Mirror/slackware-11.0/testing/source/flex/
[DIR]  ftp://ftp.eutelia.it/pub/Slackware_Mirror/slackware-12.0/source/d/flex/
[DIR]  ftp://ftp.cesca.es/mirror2/gnu/Manuals/flex/
[DIR]  ftp://ftp.cesca.es/mirror2/gnu/non-gnu/flex/
[DIR]  ftp://ftp.cesca.es/mirror2/gnu/flex/
[DIR]  ftp://ftp.cesca.es/mirror/debian-security/pool/updates/main/f/flex/
[DIR]  ftp://ftp.cesca.es/mirror/debian/pool/main/f/flex/
[DIR]  ftp://ftp.saintjoe.edu/pub/linux/slackware/slackware-current/source/d/flex/
[DIR]  ftp://ftp.uni-frankfurt.de/pub/Mirrors3/debian.org/debian-security/pool/updates/main/f/flex/
[DIR]  ftp://ftp.uni-frankfurt.de/pub/Mirrors3/debian.org/debian/pool/main/f/flex/
[DIR]  ftp://ftp.inf.utfsm.cl/pub/gnu/non-gnu/flex/
[DIR]  ftp://ftp.inf.utfsm.cl/pub/gnu/flex/
[DIR]  ftp://ftp.uni-magdeburg.de/pub/mirror/linux/slackware/source/d/flex/
[DIR]  ftp://ftp.uni-magdeburg.de/pub/mirror/linux/debian-security/pool/updates/main/f/flex/
[DIR]  ftp://ftp.uni-magdeburg.de/pub/mirror/linux/debian/pool/main/f/flex/
[DIR]  ftp://ftp.psg.com/pub/modula-2/gpm/software/flex/
[DIR]  ftp://ftp.psg.com/pub/modula-2/gpm/support/documentation/en/flex/
[DIR]  ftp://ftp.psg.com/pub/modula-2/gpm/support/flex/
[DIR]  ftp://ftp.psg.com/pub/modula-2/gpm/devnet/flex/
[DIR]  ftp://ftp.hpl.hp.com/gatekeeper/pub/cygwin/release/flex/
[DIR]  ftp://aeneas.mit.edu/pub/gnu/non-gnu/flex/
[DIR]  ftp://aeneas.mit.edu/pub/gnu/flex/
[DIR]  ftp://debian.lcs.mit.edu/pub/debian-amd64/debian-amd64/pool/main/f/flex/
[DIR]  ftp://debian.lcs.mit.edu/pub/debian-amd64/debian/pool/main/f/flex/
[DIR]  ftp://debian.lcs.mit.edu/debian-security/pool/updates/main/f/flex/
[DIR]  ftp://debian.lcs.mit.edu/debian/pool/main/f/flex/
[DIR]  ftp://ftp.kfki.hu/pub/linux/ubuntu/pool/main/f/flex/
[DIR]  ftp://ftp.kfki.hu/pub/linux/debian/pool/main/f/flex/
[DIR]  ftp://ftp.internat.freebsd.org/pub/FreeBSD/ports/textproc/flex/
[DIR]  ftp://ftp.cprm.net/.disk0/slackware/slackware-12.1/source/d/flex/
[DIR]  ftp://ftp.armedslack.org/armedslack/armedslack-11.0/source/d/flex/
[DIR]  ftp://ftp.armedslack.org/armedslack/armedslack-current/source/d/flex/
[DIR]  ftp://ftp.farlep.net/pub/Windows/CYGWIN/flex/