In the figure shown below, a rental unit can be both a house and an apartment. 
Definitions:
Sun Gear
The central or axis gear in a planetary gearset. It may be optioned to rotate or not rotate, depending on the gear arrangement and desired output ratios.
Ring Gear
A large gear that meshes with a smaller gear (pinion), often used in the differential of an automobile.
Planetary Gearset
a compact, high-torque gear system where the central gear (sun gear) drives multiple outer gears (planet gears) which in turn drive a ring gear.
Ring Gear
A large circular gear that engages with a smaller, driving gear or pinion, often found in the differential of a vehicle.
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