Similarity Expansion by clock

G
s/^/#/
:
s/# \n//
s/# \W\(.*\n\)\(.\)/\2# \1/
t
s/#\(.\)/\1#/
s/\n./\n/
t
P
h
d

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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