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#! /bin/sh
from=${1}
to=${2}
common=`printf '%s\0%s' "${from}" "${to}" | sed 's/\(.*\).*\x0\1.*/\1/' | sed 's@/[^/]*$@/@'`
prefix=`printf '%s\n' ${from#$common} | sed 's@[^/][^/]*@..@g'`
printf '%s\n' "$prefix/${to#$common}"