Twin directories of backward:

[DIR]  ftp://ftp.ticklers.org/pub/NetBSD/NetBSD-release-3-0/src/gnu/lib/libstdc++-v3/include/backward/
[DIR]  ftp://ftp.ticklers.org/pub/NetBSD/NetBSD-release-3-0/src/gnu/dist/gcc/libstdc++-v3/include/backward/
[DIR]  ftp://ftp.ticklers.org/pub/NetBSD/NetBSD-release-3-0/src/gnu/dist/gcc/libstdc++-v3/testsuite/backward/
[DIR]  ftp://ftp.free.fr/.mirrors1/ftp.netbsd.org/NetBSD-release-3-1/src/gnu/lib/libstdc++-v3_4/include/backward/
[DIR]  ftp://ftp.free.fr/.mirrors1/ftp.netbsd.org/NetBSD-release-3-1/src/gnu/dist/gcc4/libstdc++-v3/testsuite/backward/
[DIR]  ftp://ftp.free.fr/.mirrors1/ftp.netbsd.org/NetBSD-release-3-1/src/gnu/dist/gcc4/libstdc++-v3/include/backward/
[DIR]  ftp://ftp.ticklers.org/pub/NetBSD/NetBSD-current/src/gnu/lib/libstdc++-v3_4/include/backward/
[DIR]  ftp://ftp.ticklers.org/pub/NetBSD/NetBSD-current/src/gnu/dist/gcc4/libstdc++-v3/include/backward/
[DIR]  ftp://ftp.ticklers.org/pub/NetBSD/NetBSD-current/src/gnu/dist/gcc4/libstdc++-v3/testsuite/backward/
[DIR]  ftp://ftp.ticklers.org/pub/NetBSD/NetBSD-release-4-0/src/gnu/lib/libstdc++-v3_4/include/backward/
[DIR]  ftp://ftp.ticklers.org/pub/NetBSD/NetBSD-release-4-0/src/gnu/dist/gcc4/libstdc++-v3/include/backward/
[DIR]  ftp://ftp.ticklers.org/pub/NetBSD/NetBSD-release-4-0/src/gnu/dist/gcc4/libstdc++-v3/testsuite/backward/
[DIR]  ftp://ftp.ticklers.org/pub/NetBSD/NetBSD-release-3-1/src/gnu/lib/libstdc++-v3/include/backward/
[DIR]  ftp://ftp.ticklers.org/pub/NetBSD/NetBSD-release-3-1/src/gnu/dist/gcc/libstdc++-v3/include/backward/
[DIR]  ftp://ftp.ticklers.org/pub/NetBSD/NetBSD-release-3-1/src/gnu/dist/gcc/libstdc++-v3/testsuite/backward/
[DIR]  ftp://ftp.udc.es/mirror/freebsd/development/FreeBSD-CVS/src/contrib/libstdc++/include/backward/
[DIR]  ftp://ftp.nsu.ru/mirrors/ftp.freebsd.org/pub/FreeBSD/development/NetBSD-CVS/src/gnu/lib/libstdc++-v3_4/include/backward/
[DIR]  ftp://ftp.nsu.ru/mirrors/ftp.freebsd.org/pub/FreeBSD/development/NetBSD-CVS/src/gnu/dist/gcc4/libstdc++-v3/include/backward/
[DIR]  ftp://ftp.nsu.ru/mirrors/ftp.freebsd.org/pub/FreeBSD/development/NetBSD-CVS/src/gnu/dist/gcc4/libstdc++-v3/testsuite/backward/
[DIR]  ftp://ftp.nsu.ru/mirrors/ftp.freebsd.org/pub/FreeBSD/development/DragonFlyBSD-CVS/src/contrib/gcc-4.1/libstdc++-v3/include/backward/
[DIR]  ftp://ftp.nsu.ru/mirrors/ftp.freebsd.org/pub/FreeBSD/development/DragonFlyBSD-CVS/src/contrib/gcc-3.4/libstdc++-v3/include/backward/
[DIR]  ftp://core.ring.gr.jp/pub/NetBSD/NetBSD-release-3-1/src/gnu/lib/libstdc++-v3/include/backward/
[DIR]  ftp://core.ring.gr.jp/pub/NetBSD/NetBSD-release-3-1/src/gnu/dist/gcc/libstdc++-v3/include/backward/
[DIR]  ftp://core.ring.gr.jp/pub/NetBSD/NetBSD-release-3-1/src/gnu/dist/gcc/libstdc++-v3/testsuite/backward/
[DIR]  ftp://ftp.free.fr/.mirrors1/ftp.netbsd.org/NetBSD-release-3-1/src/gnu/lib/libstdc++-v3/include/backward/
[DIR]  ftp://ftp.esat.net/mirrors/.3/ftp.netbsd.org/pub/NetBSD/NetBSD-release-3-1/src/gnu/lib/libstdc++-v3/include/backward/
[DIR]  ftp://128.118.2.96/pub/.mirrors/1/ftp.netbsd.org/pub/NetBSD/NetBSD-release-3-1/src/gnu/lib/libstdc++-v3/include/backward/
[DIR]  ftp://ftp.netbsd.org/pub/NetBSD/NetBSD-release-3-1/src/gnu/lib/libstdc++-v3/include/backward/
[DIR]  ftp://ftp.sk.freebsd.org/pub/NetBSD/NetBSD-release-3-1/src/gnu/lib/libstdc++-v3/include/backward/
[DIR]  ftp://ftp5.freebsd.org/pub/NetBSD/NetBSD-release-3-1/src/gnu/lib/libstdc++-v3/include/backward/
[DIR]  ftp://ftp.pub.ro/pub/mirrors/netbsd.org/NetBSD-release-3-1/src/gnu/lib/libstdc++-v3/include/backward/
[DIR]  ftp://ftp.pub.ro/pub/pub/mirrors/netbsd.org/NetBSD-release-3-1/src/gnu/lib/libstdc++-v3/include/backward/
[DIR]  ftp://ftp.sh.cvut.cz/storage/1/netbsd/NetBSD-release-3-1/src/gnu/lib/libstdc++-v3/include/backward/
[DIR]  ftp://ftp.free.fr/.mirrors1/ftp.netbsd.org/NetBSD-release-3-1/src/gnu/dist/gcc/libstdc++-v3/include/backward/
[DIR]  ftp://ftp.free.fr/.mirrors1/ftp.netbsd.org/NetBSD-release-3-1/src/gnu/dist/gcc/libstdc++-v3/testsuite/backward/
[DIR]  ftp://ftp.esat.net/mirrors/.3/ftp.netbsd.org/pub/NetBSD/NetBSD-release-3-1/src/gnu/dist/gcc/libstdc++-v3/include/backward/
[DIR]  ftp://ftp.esat.net/mirrors/.3/ftp.netbsd.org/pub/NetBSD/NetBSD-release-3-1/src/gnu/dist/gcc/libstdc++-v3/testsuite/backward/
[DIR]  ftp://128.118.2.96/pub/.mirrors/1/ftp.netbsd.org/pub/NetBSD/NetBSD-release-3-1/src/gnu/dist/gcc/libstdc++-v3/include/backward/
[DIR]  ftp://128.118.2.96/pub/.mirrors/1/ftp.netbsd.org/pub/NetBSD/NetBSD-release-3-1/src/gnu/dist/gcc/libstdc++-v3/testsuite/backward/
[DIR]  ftp://ftp.netbsd.org/pub/NetBSD/NetBSD-release-3-1/src/gnu/dist/gcc/libstdc++-v3/include/backward/
[DIR]  ftp://ftp.sk.freebsd.org/pub/NetBSD/NetBSD-release-3-1/src/gnu/dist/gcc/libstdc++-v3/include/backward/
[DIR]  ftp://ftp5.freebsd.org/pub/NetBSD/NetBSD-release-3-1/src/gnu/dist/gcc/libstdc++-v3/include/backward/
[DIR]  ftp://ftp.netbsd.org/pub/NetBSD/NetBSD-release-3-1/src/gnu/dist/gcc/libstdc++-v3/testsuite/backward/
[DIR]  ftp://ftp.sk.freebsd.org/pub/NetBSD/NetBSD-release-3-1/src/gnu/dist/gcc/libstdc++-v3/testsuite/backward/
[DIR]  ftp://ftp5.freebsd.org/pub/NetBSD/NetBSD-release-3-1/src/gnu/dist/gcc/libstdc++-v3/testsuite/backward/
[DIR]  ftp://ftp.pub.ro/pub/pub/mirrors/netbsd.org/NetBSD-release-3-1/src/gnu/dist/gcc/libstdc++-v3/include/backward/
[DIR]  ftp://ftp.pub.ro/pub/pub/mirrors/netbsd.org/NetBSD-release-3-1/src/gnu/dist/gcc/libstdc++-v3/testsuite/backward/
[DIR]  ftp://ftp.sh.cvut.cz/storage/1/netbsd/NetBSD-release-3-1/src/gnu/dist/gcc/libstdc++-v3/include/backward/
[DIR]  ftp://ftp.sh.cvut.cz/storage/1/netbsd/NetBSD-release-3-1/src/gnu/dist/gcc/libstdc++-v3/testsuite/backward/
[DIR]  ftp://ftp.lug.udel.edu/pub/netbsd/NetBSD-release-3-1/src/gnu/lib/libstdc++-v3/include/backward/