Machine sets
I refer to as Machine sets or Multiplets, the set of machines related to each other by symmetry. If interested, read about general considerations in symmetrical machines.
4 Step set.
Balleninja set.
Ballerina set and Ballerouta set.
Bee sets.
Boomerang set.
Catherine's Wheel set.
Futurina set and Futurouta set.
Hop set.
Isostar set and Osostar set.
Linea Alba set.
Ninja Star and Nunchuck - these are in the same set.
Piterie set.
Piterina set and Piterouta set.
Rotisserie set.