Planting can be difficult.Logical formLearned from10 sentences. (Border crossings) can be difficult.Logical formLearned from10 sentences. A (negotiating partner) can be difficult.Logical formLearned from10 sentences. A digestion can be difficult.Logical formLearned from10 sentences. A nature can be difficult.Logical formLearned from10 sentences. Responsibilities can be difficult.Logical formLearned from10 sentences. Labors can be difficult.Logical formLearned from10 sentences. Causes can be difficult.Logical formLearned from10 sentences. A (reading material) can be difficult.Logical formLearned from10 sentences. A transaction can be difficult.Logical formLearned from10 sentences. A cake can be difficult.Logical formLearned from10 sentences. Interest can be difficult.Logical formLearned from10 sentences. A map can be difficult.Logical formLearned from10 sentences. A controversy can be difficult.Logical formLearned from10 sentences. Medical care can be difficult.Logical formLearned from10 sentences.