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/