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Why do helicopters vary between 2-4 rotor blades? - Quora
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Twin rotor helicopters hi-res stock photography and images - Alamy
Mini Electric Chopper, Electric Meat Grinder, Mini Portable Onion Chopper with Two Blades, Mini Chopper for Garlic/Onions/Vegetables/Walnuts/Salad/Pepper (250ml) : Amazon.co.uk: Home & Kitchen
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