sed ':0
N
s/[0-9]//
$!b0
:
s/\(\w*\)\(\w\+\)\b\(.*\)\b\(\2\w*\)/\1\4\3/
s/\(\w\+\)\(.*\)\b\(\w*\1\)\b/\3\2/
t
s/\(\(\w\).*\)\2/\1/
t
/\w\n.*\w/c-1'