A (business decision) can be difficult.Logical formLearned from20 sentences. Efforts may prove difficult.Logical formLearned from20 sentences. Propositions can be difficult.Logical formLearned from20 sentences. Pressure can be difficult.Logical formLearned from20 sentences. A possession can be difficult.Logical formLearned from20 sentences. A need can be difficult.Logical formLearned from20 sentences. Mobility can be difficult.Logical formLearned from20 sentences. Concerns can be difficult.Logical formLearned from20 sentences. A variable can be difficult.Logical formLearned from20 sentences. Injuries can be difficult.Logical formLearned from20 sentences. An engine can be difficult.Logical formLearned from20 sentences. An (application process) can be difficult.Logical formLearned from20 sentences. A resolution can be difficult.Logical formLearned from20 sentences. Components can be difficult.Logical formLearned from20 sentences. Digging can be difficult.Logical formLearned from20 sentences.