An adjustment can be difficult.Logical formLearned from406 sentences. A pregnancy can be difficult.Logical formLearned from402 sentences. Negotiations can be difficult.Logical formLearned from394 sentences. A question can be difficult.Logical formLearned from392 sentences. A schedule can be difficult.Logical formLearned from384 sentences. A birth can be difficult.Logical formLearned from382 sentences. Progress can be difficult.Logical formLearned from381 sentences. (Trading conditions) can be difficult.Logical formLearned from381 sentences. Identification can be difficult.Logical formLearned from379 sentences. Passages can be difficult.Logical formLearned from379 sentences. A project can be difficult.Logical formLearned from376 sentences. A vote can be difficult.Logical formLearned from375 sentences. A point can be difficult.Logical formLearned from372 sentences. A set can be difficult.Logical formLearned from371 sentences. A search can be difficult.Logical formLearned from370 sentences.