A (restaurant chain) may specialize in hamburgers.Logical formLearned from2 sentences. A hamburger can be firm.Logical formLearned from2 sentences. A hamburger can be acquired.Logical formLearned from2 sentences. An (onion hamburger) may undergo a cooking.Logical formLearned from2 sentences. An (onion hamburger) may pertain-to the world.Logical formLearned from2 sentences. A hamburger can be documentary.Logical formLearned from2 sentences. Hamburgers can be in buns.Logical formLearned from2 sentences. A hamburger may be served with lettuce.Logical formLearned from2 sentences. A hamburger may be served with cheese.Logical formLearned from2 sentences. Toppings can be on hamburgers.Logical formLearned from2 sentences. A hamburger can be on a bun.Logical formLearned from2 sentences. A hamburger may be served on a bun.Logical formLearned from2 sentences. A hamburger may be made by a male of a US-city.Logical formLearned from2 sentences. A (hamburger bun) can be seeded.Logical formLearned from2 sentences. A female may chow_down on a hamburger.Logical formLearned from2 sentences.