hello hello world by kanitawa

iworld
s/^/00000/
:
h
y/012/120/
G
s/^.*\([^0]0*\)\n\(.*\)[^2]2*$/\2\1/
h
s/^0*//
s/0/world /g
s/1/hello /g
s/2/world! /g
s/ $//p
g
/10200/!t
d

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

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