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