(Opinion surveys) may confirm a popularity of a flat tax.Logical formLearned from20 sentences. A flat tax may increase a gross domestic product by a (percentage point).Logical formLearned from20 sentences. A flat tax may be proposed.Logical formLearned from20 sentences. A flat tax can be on a market.Logical formLearned from20 sentences. An idea can be a flat tax.Logical formLearned from20 sentences. An effect of a flat tax can be that something-is-the-case.Logical formLearned from20 sentences. Governments may worry about an effect of a flat tax.Logical formLearned from20 sentences. A center can be flat.Logical formLearned from20 sentences. A topology can be flat.Logical formLearned from20 sentences. (Fan nozzles) can be flat.Logical formLearned from20 sentences. A fenland can be flat.Logical formLearned from20 sentences. Cheeks can be flat.Logical formLearned from20 sentences. (File databases) can be flat.Logical formLearned from20 sentences. Trays can be flat.Logical formLearned from20 sentences. A rim can be flat.Logical formLearned from20 sentences.