A (price increase) can be necessary.Logical formLearned from6 sentences. Supplies can be necessary for crop-dustings.Logical formLearned from6 sentences. Heights can be necessary for a security.Logical formLearned from6 sentences. An approach can be necessary for policy.Logical formLearned from6 sentences. A visit to a country can be necessary.Logical formLearned from6 sentences. A citation can be necessary.Logical formLearned from6 sentences. (Runoff elections) can be necessary.Logical formLearned from6 sentences. An association can be necessary.Logical formLearned from6 sentences. A legislative process can be necessary.Logical formLearned from6 sentences. Use of (air power) can be necessary.Logical formLearned from6 sentences. A censorship can be necessary.Logical formLearned from6 sentences. Fine may deem necessary.Logical formLearned from6 sentences. A (task force) can be necessary.Logical formLearned from6 sentences. (Flight bans) can be necessary.Logical formLearned from6 sentences. (Border closures) can be necessary.Logical formLearned from6 sentences.