(Mail filters) may pertain-to a person.Logical formLearned from13 sentences. A (polarizer filter) can be circular.Logical formLearned from13 sentences. Filters can be online.Logical formLearned from13 sentences. Filters may win.Logical formLearned from13 sentences. Respirators can be with filters.Logical formLearned from13 sentences. Filters can be spare.Logical formLearned from13 sentences. (Air filters) can be electrostatic.Logical formLearned from13 sentences. Filters can be catalytic.Logical formLearned from13 sentences. A filter can be approved.Logical formLearned from13 sentences. A filter can be linear.Logical formLearned from13 sentences. Filters can be bacterial.Logical formLearned from13 sentences. Filters can be regular.Logical formLearned from13 sentences. An end may pertain-to a filter.Logical formLearned from13 sentences. Filters may pertain-to a world-city.Logical formLearned from13 sentences. A filter can be active.Logical formLearned from13 sentences.