Twin directories of which:

[DIR]  ftp://134.121.1.1/.snapshot/nightly.3/pub/gnu/which/
[DIR]  ftp://134.121.1.1/pub/gnu.OLD/which/
[DIR]  ftp://134.121.1.1/.snapshot/nightly.2/pub/gnu/which/
[DIR]  ftp://134.121.1.1/.snapshot/nightly.1/pub/gnu/which/
[DIR]  ftp://134.121.1.1/.snapshot/nightly.0/pub/gnu/which/
[DIR]  ftp://134.121.1.1/.snapshot/hourly.1/pub/gnu/which/
[DIR]  ftp://ftp.eutelia.it/pub/Slackware_Mirror/slackware-12.1/source/a/which/
[DIR]  ftp://ftp.eutelia.it/pub/Slackware_Mirror/slackware-current/source/a/which/
[DIR]  ftp://ftp.eutelia.it/pub/Slackware_Mirror/slackware-12.0/source/a/which/
[DIR]  ftp://ftp.cesca.es/mirror2/gnu/which/
[DIR]  ftp://ftp.saintjoe.edu/pub/linux/slackware/slackware-current/source/a/which/
[DIR]  ftp://ftp.inf.utfsm.cl/pub/gnu/which/
[DIR]  ftp://ftp.uni-magdeburg.de/pub/mirror/linux/slackware/source/a/which/
[DIR]  ftp://ftp.hpl.hp.com/gatekeeper/pub/cygwin/release/which/
[DIR]  ftp://aeneas.mit.edu/pub/gnu/which/
[DIR]  ftp://ftp.cprm.net/.disk0/slackware/slackware-12.1/source/a/which/
[DIR]  ftp://ftp.armedslack.org/armedslack/armedslack-current/source/a/which/
[DIR]  ftp://ftp.farlep.net/pub/Windows/CYGWIN/which/
[DIR]  ftp://ftp.farlep.net/pub/linux/Slackware-12.0/d4/source/a/which/
[DIR]  ftp://ftp.scw.net.br/pub/slamd64/slamd64-12.2/source/a/which/
[DIR]  ftp://ftp.skynet.be/mirror1/slackware.com/slackware-current/source/a/which/
[DIR]  ftp://ftp.skynet.be/mirror1/slackware.com/slackware-12.0/source/a/which/
[DIR]  ftp://ftp.skynet.be/mirror1/slackware.com/slackware-12.1/source/a/which/
[DIR]  ftp://ftp.skynet.be/mirror1/slackware.com/slackware-12.2/source/a/which/
[DIR]  ftp://ftp.kreonet.re.kr/gnu/ibiblio/www/savannah-checkouts/gnu/which/
[DIR]  ftp://ftp.kreonet.re.kr/gnu/ibiblio/ftp/gnu/which/
[DIR]  ftp://ftp.kreonet.re.kr/OS/cygwin/release/which/
[DIR]  ftp://ftp.kreonet.re.kr/OS/cygwin/release-2/.unionfs/which/
[DIR]  ftp://ftp.kreonet.re.kr/OS/cygwin/release-2/which/
[DIR]  ftp://ftp.prz.rzeszow.pl/pub/gentoo/portage/sys-apps/which/
[DIR]  ftp://ftp.fagskolen.gjovik.no/pub/cygwin/release-2/which/
[DIR]  ftp://ftp.fagskolen.gjovik.no/pub/cygwin/release-2/.unionfs/which/
[DIR]  ftp://ftp.fagskolen.gjovik.no/pub/cygwin/release/which/
[DIR]  ftp://ftp.cs.odu.edu/pub/ibl/software/cygwin/ftp%3a%2f%2fftp.cise.ufl.edu%2fpub%2fmirrors%2fcygwin/release/which/
[DIR]  ftp://ftp.nz.debian.org/gentoo-x86-portage/sys-apps/which/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/linux/slackware/source/a/which/
[DIR]  ftp://ftp.slackware.at/slackware-12.2/source/a/which/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/gnu/gnu/which/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/FreeBSD/development/FreeBSD-CVS/src/usr.bin/which/
[DIR]  ftp://134.121.1.56/pub/gnu/which/
[DIR]  ftp://134.121.1.56/pub/gnu.OLD/which/
[DIR]  ftp://134.121.1.56/.snapshot/nightly.3/pub/gnu/which/
[DIR]  ftp://134.121.1.56/.snapshot/nightly.0/pub/gnu/which/
[DIR]  ftp://134.121.1.56/.snapshot/nightly.1/pub/gnu/which/
[DIR]  ftp://134.121.1.56/.snapshot/nightly.2/pub/gnu/which/
[DIR]  ftp://ftp.cc.keio.ac.jp/gnu/which/
[DIR]  ftp://ftp.ri.telefonica-data.net/slackware/slackware64-current/source/a/which/
[DIR]  ftp://134.121.1.1/.snapshot/nightly.3/pub/gnu.OLD/which/
[DIR]  ftp://ftp.cs.ubc.ca/local/hsh2006/PACKAGES/Development_Tools/Cygwin/release/which/
[DIR]  ftp://ftp.cs.ubc.ca/local/hsh2007/Packages/Development_Tools/Cygwin/release/which/