As an AI language model, I do not have access to specific information about every single duplex villa in the world. However, based on general knowledge, below are some common types of swimming pools that could be used in duplex villas:
1. In-ground pools: These are perhaps the most common type of swimming pools in duplex villas. They are built into the ground and can be made from various materials such as concrete, fiberglass, or vinyl.
2. Above-ground pools: As the name suggests, these pools are built above the ground and are typically less expensive and easier to install than in-ground pools.
3. Lap pools: These are long and narrow swimming pools designed for swimming laps. They are ideal for fitness enthusiasts and can be installed in the backyard of a duplex villa.
4. Infinity pools: These pools create the illusion of water spilling over the edge of the pool, creating a serene and relaxing atmosphere. They are typically built on high elevations to enhance their visual appeal.
5. Natural swimming pools: These are environmentally friendly swimming pools designed to mimic natural bodies of water such as ponds or lakes. They typically have a water filtration system that uses plants and other natural materials to keep the water clean and free of chemicals.
Note that the swimming pool type used in duplex villas would depend on factors such as space, budget, personal preferences, and local regulations.
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