Related Clues:

• Phases of the moon, say
• Two quartets
• Spider's legs, e.g.
• Pizza slices, usually
• Tetrad times two
• Two quartets?
• Santa's reindeer, traditionally
• Square-dance complement
• Rowing team, e.g.
• Hat size fractions
• Ennead minus one
• Some musical notes
• Octaves
• Ennead less one
• The Ivies, e.g.