s/.*/	& /
:
s/>....\|....<//
s/	L\(4.\{9\}\|3.\{6\}\|2...\|1\)....\|	.0./>&	/
t
s/...\(.\{9\}	R4\|.\{6\}	R3\|...	R2\|	R1\)./&<& </
t
L
d