Last names of 20th-century US presidents – Bush/Carter/Truman;

Former names of current Asian nations – Burma/Persia/Siam;

Last names of French Impressionist painters – Manet/Monet/Renoir;

African countries in OPEC – Algeria/Angola/Libya;

Sons of Queen Elizabeth II – Andrew/Charles/Edward;

US cabinet departments – Energy/Labor/State;

Chinese dynasties – Chin/Shang/Tang;

World War I battles – Marne/Somme/Ypres;

Historic ‘ages’ – bronze/iron/stone;

Last names of US Civil War generals – Custer/Lee/Meade.