A (spam filter) can be sensitive.Logical formLearned from21 sentences. (Air filters) can be clogged.Logical formLearned from21 sentences. (Color filters) can be lurid.Logical formLearned from21 sentences. A filter can be dirty.Logical formLearned from21 sentences. Filters can be improved.Logical formLearned from21 sentences. Filters can be reusable.Logical formLearned from21 sentences. A filter can be replaceable.Logical formLearned from21 sentences. A person may define filters.Logical formLearned from21 sentences. Images may be took through filters.Logical formLearned from21 sentences. A person may set filters.Logical formLearned from21 sentences. A person may have a filter.Logical formLearned from21 sentences. A filter can be integrated.Logical formLearned from21 sentences. Filters can be fresh.Logical formLearned from21 sentences. Filters may be designed.Logical formLearned from20 sentences. A filter can be in place.Logical formLearned from20 sentences.