A (spy plane) may fly.Logical formLearned from21 sentences. Sailors may be flown to a country.Logical formLearned from21 sentences. (Surveillance planes) may fly missions.Logical formLearned from21 sentences. A racket may fly.Logical formLearned from21 sentences. A pilot may fly over a country.Logical formLearned from21 sentences. A person may fly to the sun.Logical formLearned from21 sentences. A ball may fly over a bar.Logical formLearned from21 sentences. A son may fly to a world-city.Logical formLearned from21 sentences. Aircraft may fly at altitudes.Logical formLearned from21 sentences. National flags may fly at half-mast.Logical formLearned from20 sentences. A national flag may fly.Logical formLearned from20 sentences. (War planes) may fly.Logical formLearned from20 sentences. Helicopters may fly over a town.Logical formLearned from20 sentences. A squadron may fly.Logical formLearned from20 sentences. A spacecraft may fly by a planet.Logical formLearned from20 sentences.