Old MacDonald by tails (McBusLuck)

set moo baa quack oink
x=,\ E-I-E-I-O.
eval '
here
b="With a $1-$1 $_, and a $1-$1 t$_.
Here a $1, t$_ a $1, everyw$_ a $1-$1.
${b+A}${b:6}"
shift
"Old MacDonald had a farm$x"
echo "$_
And on his farm he had a '{cow,sheep,duck,pig}'$x
${b// o/n o}$_
"'

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

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