A survey may be based on a sample of some households.Logical formLearned from63 sentences. Participants may undergo a survey.Logical formLearned from63 sentences. A survey may state that something-is-the-case.Logical formLearned from63 sentences. Surveys can be airborne.Logical formLearned from63 sentences. Questions can be in a survey.Logical formLearned from63 sentences. A survey can be planned.Logical formLearned from63 sentences. A survey may pertain-to a planet.Logical formLearned from63 sentences. Surveys can be mailed.Logical formLearned from63 sentences. A survey can be a step.Logical formLearned from63 sentences. A survey may show (consumer confidence).Logical formLearned from63 sentences. A survey can be by a (polling firm).Logical formLearned from63 sentences. A survey can be by a (polling institute).Logical formLearned from63 sentences. Results may pertain-to an economic survey.Logical formLearned from62 sentences. Some months can be prior to a survey.Logical formLearned from62 sentences. Changes may be based on results of a (market survey).Logical formLearned from62 sentences.