(Oil prices) may buoy optimism.Logical formLearned from4 sentences. (Poll results) can be on optimism.Logical formLearned from4 sentences. An explosion may express optimism.Logical formLearned from4 sentences. Pioneers may share an optimism.Logical formLearned from4 sentences. The world may lose optimism.Logical formLearned from4 sentences. An optimism may coincide with a retreat.Logical formLearned from4 sentences. Optimism can be about asian economies.Logical formLearned from4 sentences. An optimism can be uneasy.Logical formLearned from4 sentences. Optimism can be among managers.Logical formLearned from4 sentences. A move may reflect optimism.Logical formLearned from4 sentences. Optimism can be over a strength of the economy.Logical formLearned from4 sentences. An optimism may apply to a country.Logical formLearned from4 sentences. A change can be from an optimism.Logical formLearned from4 sentences. An optimism can be dangerous.Logical formLearned from4 sentences. Optimism may exist that something-is-the-case.Logical formLearned from4 sentences.