A (spy agency) can be secret.Logical formLearned from15 sentences. An operation may involve spies.Logical formLearned from15 sentences. A (spy aircraft) can be pilotless.Logical formLearned from15 sentences. Activities may pertain-to a (spy agency).Logical formLearned from15 sentences. A case can be among a series of (spy cases).Logical formLearned from15 sentences. A (spy chief) can be powerful.Logical formLearned from15 sentences. A (spy plane) may land in a country.Logical formLearned from15 sentences. An agent may pose as a spy.Logical formLearned from15 sentences. Technicians may inspect a (spy plane).Logical formLearned from15 sentences. A (spy plane incident) may undergo handling.Logical formLearned from15 sentences. A release may pertain-to a (spy plane crew).Logical formLearned from15 sentences. A collision may pertain-to a (spy plane).Logical formLearned from15 sentences. A detention of a (spy plane crew) can be a factor.Logical formLearned from15 sentences. (Spy leaders) may work in a homeland.Logical formLearned from15 sentences. A spy may be planted.Logical formLearned from15 sentences.