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2.  

1. A car is more expensive than a bicycle.
2. A bicycle is cheaper than a car.
3. A car isn't as slow as a bicycle.
4. A bicycle is less comfortable than a car.

3.

1. A dog is more intelligent than a cat.
2. A cat is as playful as a dog.
3. A dog is quieter than a cat.
4. A cat isn't as friendly as a dog.