Twin directories of 4:

[DIR]  ftp://ftp.cs.rutgers.edu/cs/Events.OLD/Amarel/Powerpoints/4/
[DIR]  ftp://ftp.kemsu.ru/4/
[DIR]  ftp://ftp.kemsu.ru/incoming/oberon/222/4/
[DIR]  ftp://ftp.kemsu.ru/incoming/str/4/
[DIR]  ftp://82.96.64.7/pub/linux/kernel/people/mbligh/benchmarks/2.5.65-mm2/sdetbench/4/
[DIR]  ftp://82.96.64.7/pub/linux/kernel/people/mbligh/benchmarks/2.5.65-mm3/sdetbench/4/
[DIR]  ftp://82.96.64.7/pub/linux/kernel/people/mbligh/benchmarks/2.5.66-mm2/sdetbench/4/
[DIR]  ftp://82.96.64.7/pub/linux/kernel/people/mbligh/benchmarks/2.5.66-mm2-ext3/sdetbench/4/
[DIR]  ftp://82.96.64.7/pub/linux/kernel/people/christoph/patch-archive/2008/largeblock/cleanup/4/
[DIR]  ftp://82.96.64.7/pub/linux/kernel/people/christoph/patch-archive/2008/largeblock/vcp/4/
[DIR]  ftp://82.96.64.7/pub/linux/kernel/people/christoph/patch-archive/2008/largeblock/4/
[DIR]  ftp://82.96.64.7/pub/linux/kernel/people/christoph/patch-archive/2008/nslab/4/
[DIR]  ftp://82.96.64.7/pub/linux/kernel/people/christoph/patch-archive/2008/pageflags/4/
[DIR]  ftp://82.96.64.7/pub/linux/kernel/people/christoph/largeblocksize/4/
[DIR]  ftp://82.96.64.7/pub/linux/kernel/people/christoph/patch-archive/2004/ptoss/posts/4/
[DIR]  ftp://ftp.dit.upm.es/mirrors/ftp.rediris.es/mirror/freshrpms/fedora/linux/testing/4/
[DIR]  ftp://ftp.dit.upm.es/mirrors/ftp.rediris.es/mirror/freshrpms/fedora/linux/4/
[DIR]  ftp://ftp.dit.upm.es/mirrors/ftp.rediris.es/mirror/freshrpms/fedora/linux/debug/4/
[DIR]  ftp://ftp.dit.upm.es/mirrors/ftp.rediris.es/mirror/fedora-legacy/fedora/4/
[DIR]  ftp://ftp.dit.upm.es/mirrors/ftp.rediris.es/mirror/fedora-extras/4/
[DIR]  ftp://ftp.novell.com/pub/mono/archive/1.2.4/macos-10-universal/4/
[DIR]  ftp://ftp.novell.com/pub/mono/archive/1.2.4/sunos-8-sparc/4/
[DIR]  ftp://ftp.novell.com/pub/mono/archive/1.2.6/linux-installer/4/
[DIR]  ftp://ftp.novell.com/pub/mono/archive/1.2.6/macos-10-universal/4/
[DIR]  ftp://ftp.novell.com/pub/mono/archive/1.2.6/windows-installer/4/
[DIR]  ftp://ftp.novell.com/pub/mono/archive/1.9/windows-installer/4/
[DIR]  ftp://ftp.novell.com/pub/mono/archive/2.0/macos-10-universal/4/
[DIR]  ftp://ftp.unice.fr/linux/fedora/distrib/4/
[DIR]  ftp://ftp.unice.fr/linux/fedora/updates/4/
[DIR]  ftp://ftp.eenet.ee/pub/FreeBSD/distfiles/rpm/i386/fedora/4/
[DIR]  ftp://ftp.eenet.ee/doc/LDP/LDP/khg/HyperNews/get/devices/basics/4/
[DIR]  ftp://ftp.eenet.ee/doc/LDP/LDP/khg/HyperNews/get/devices/block/4/
[DIR]  ftp://ftp.eenet.ee/doc/LDP/LDP/khg/HyperNews/get/devices/devices/4/
[DIR]  ftp://ftp.eenet.ee/doc/LDP/LDP/khg/HyperNews/get/devices/reference/4/
[DIR]  ftp://ftp.eenet.ee/doc/LDP/LDP/khg/HyperNews/get/khg/2/1/4/
[DIR]  ftp://ftp.eenet.ee/doc/LDP/LDP/khg/HyperNews/get/khg/55/4/
[DIR]  ftp://ftp.eenet.ee/doc/LDP/LDP/khg/HyperNews/get/khg/9/4/
[DIR]  ftp://ftp.eenet.ee/doc/LDP/LDP/khg/HyperNews/get/other/4/
[DIR]  ftp://ftp.eenet.ee/doc/LDP/LDP/khg/HyperNews/get/tour/tour/4/
[DIR]  ftp://ftp.linux.it/ubuntu/pool/universe/4/
[DIR]  ftp://ftp.linux.it/debian/pool/main/4/
[DIR]  ftp://ftp.eutelia.it/pub/Sunsite_Mirror/kernel.org/pub/kernel/people/mbligh/benchmarks/2.5.65-mm2/sdetbench/4/
[DIR]  ftp://ftp.eutelia.it/pub/Sunsite_Mirror/kernel.org/pub/kernel/people/mbligh/benchmarks/2.5.65-mm3/sdetbench/4/
[DIR]  ftp://ftp.eutelia.it/pub/Sunsite_Mirror/kernel.org/pub/kernel/people/mbligh/benchmarks/2.5.66-mm2/sdetbench/4/
[DIR]  ftp://ftp.eutelia.it/pub/Sunsite_Mirror/kernel.org/pub/kernel/people/mbligh/benchmarks/2.5.66-mm2-ext3/sdetbench/4/
[DIR]  ftp://ftp.eutelia.it/pub/Sunsite_Mirror/kernel.org/pub/kernel/people/christoph/patch-archive/2008/largeblock/cleanup/4/
[DIR]  ftp://ftp.eutelia.it/pub/Sunsite_Mirror/kernel.org/pub/kernel/people/christoph/patch-archive/2008/largeblock/vcp/4/
[DIR]  ftp://ftp.eutelia.it/pub/Sunsite_Mirror/kernel.org/pub/kernel/people/christoph/patch-archive/2008/largeblock/4/
[DIR]  ftp://ftp.eutelia.it/pub/Sunsite_Mirror/kernel.org/pub/kernel/people/christoph/patch-archive/2008/nslab/4/
[DIR]  ftp://ftp.eutelia.it/pub/Sunsite_Mirror/kernel.org/pub/kernel/people/christoph/patch-archive/2008/pageflags/4/