s/^/ab=======\nacd=\nefcd=-\neghd\negi====/
:
s/=/--/
s/\(\w*\)-/\1\n\1/
t
s/[adeg]/&&/g
s/[abi]/&&&/g
s/[ai]/&&&/g
s/[df]/&&&&/g
s/[bg]/&&&&&/g
s/[ce]/&&&&&&&/g
s/\w/ &/g