s/^/XTVcowTUmoo XTNXTVsheepTUbaa Ymoo XTNXTVduckTUquack Ybaa Ymoo XTNXTVpigTUoink Yquack Ybaa Ymoo XT/ : s/X/Old MacDonald had a farm/ s/T/, E-I-E-I-O.N/ s/V/And on his farm he had a / s/Z\(\w*\) /Here a \1, there a \1, everywhere a \1-\1.N/ s/U\(\w*\) /With a \1-\1 here, and a \1-\1 there.NZ\1 / s/Y\(\w*\) /A \1-\1 here, and a \1-\1 there.NZ\1 / s/a o/an o/ t y/N/\n/
Note that non-ascii characters in the above source code will be escaped (such as \x9f).