(Class frigates) may be designed in a country.Logical formLearned from2 sentences. A military-or-other-action-organization may sell a country some (class frigates).Logical formLearned from2 sentences. A (navy frigate) may intervene.Logical formLearned from2 sentences. A frigate may exchange fire with a (pirate vessel).Logical formLearned from2 sentences. A russian navy may have a number of frigates.Logical formLearned from2 sentences. A frigate may participate in a mission.Logical formLearned from2 sentences. Part can be to sales of a (multipurpose frigate).Logical formLearned from2 sentences. Sales may pertain-to a (multipurpose frigate).Logical formLearned from2 sentences. Commissions may be paid on a sale of some frigates to a country.Logical formLearned from2 sentences. A frigate may escort some ships.Logical formLearned from2 sentences. A helicopter may operate from a frigate.Logical formLearned from2 sentences. A frigate may respond to a call.Logical formLearned from2 sentences. A frigate may chase boats.Logical formLearned from2 sentences. A military-or-other-action-organization may transmit an information to a frigate.Logical formLearned from2 sentences. A frigate may track a (pirate skiff).Logical formLearned from2 sentences.