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.
Bee sets.
Isostar set and Osostar set.
Futurina set and Futurouta set.
Hop set.
Ninja Star and Nunchuck - these are in the same set.
Piterie set.
Piterina set and Piterouta set.