Finally there’s extended diacope. All the previous examples have had the structure ABA. But you can extend that to AABA. When Richard III is dying he shouts, ‘A horse! A horse! My kingdom for a horse!’ Shakespeare knew a show-stopping line when he wrote one, which is probably why he stole his own formula for Juliet on her balcony asking, ‘Romeo, Romeo, wherefore art thou Romeo?’
