x
s/$/=/
:0
s/^=/1/
s/=/=0123456789=0 /
s/\(.\)=.*\1\(=*.\).* /\2/
t0
G
s/\(.*\)\n\(.*\)/\1 \2@\1/
:1
s/.\{,40\} /&!/
h
s/$/>					/
s/	/								/g
:2
s/!.*>\| \|\S	//
t2
G
h
s/[^ ]\| !.*//g
y/ /	/
G
s/ !.*//
:3
s/\(\n\(	*\).*\) /\1\2/
t3
s/\n	*//
:
s/^\(\(	*\)\n[^	]*\)\2/\1 /
t
s/	\(\S\)/\1	/
t
s/.*\n//p
g
s/.* !//
/.\{41\}@/b1
h
s/.*@//
x
s/@.*//