Old MacDonald by tails (%20)

s/$/cow\
sheep-baa\
duck\
pig-oink/m
s//-quack-baa/3g
s/.*/@And on his farm he had_&-moo@/mg
s/-\w*/A && !, and_&& t!.\
Here_&, t!_&, everyw!_&&.\n/g
:
s/ -/ /
s/\BA/#With a/
s/@/Old MacDonald had_farm#/
s/#/, E-I-E-I-O.\n/
s/!/here/
s/_/ a /
t
s/ oi/n&/g

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

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