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In comparison with navigator, phone and laptop, a computer is the most expensive. Navigator and the phone are the smallest and also the cheapest. In my opinion laptop and computer are the best appliances.

A phone is smaller than computer.
Navigator is more expensive than telephone.
Laptop is better than computer.
Navigator is cheaper than laptop.
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Laptop is the biggest, and the best. Computer is the most expensive and worst than laptop, because it's too big, so I don't like it. I think that navigation it the most cheap. What about mobile phone? It's small, and the best of these devices.
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