A government may collapse without a sibling.Logical formLearned from9 sentences. An (apartment block) may collapse after a (bombing raid).Logical formLearned from9 sentences. A stalinist regime may collapse.Logical formLearned from9 sentences. A roof of an (exposition hall) may collapse.Logical formLearned from9 sentences. A social-security system may collapse.Logical formLearned from9 sentences. Some runners may collapse.Logical formLearned from9 sentences. Thousands of houses may collapse.Logical formLearned from9 sentences. A medical system may collapse.Logical formLearned from9 sentences. Talks may collapse last weekend.Logical formLearned from9 sentences. A round of negotiations may collapse.Logical formLearned from9 sentences. Part of a (government office building) may collapse.Logical formLearned from8 sentences. A person may collapse on a bench.Logical formLearned from8 sentences. Some tunnels may collapse.Logical formLearned from8 sentences. A negotiation may collapse.Logical formLearned from8 sentences. Equipment may collapse.Logical formLearned from8 sentences.