(Research companies) may solve riddles.Logical formLearned from3 sentences. A riddle may pertain-to a sea.Logical formLearned from3 sentences. Riddles can be longstanding.Logical formLearned from3 sentences. Riddles may pertain-to the future.Logical formLearned from3 sentences. A mention of a riddle may be made in hearings.Logical formLearned from3 sentences. A riddle can be archeological.Logical formLearned from3 sentences. A decline can be a riddle.Logical formLearned from3 sentences. A riddle can be to persons.Logical formLearned from3 sentences. Riddles may pertain-to an unknown.Logical formLearned from3 sentences. A riddle can be elegant.Logical formLearned from3 sentences. A crystalline structure can be responsible for a series of riddles.Logical formLearned from3 sentences. A riddle may pertain-to an origin.Logical formLearned from3 sentences. A riddle may pertain-to a serve.Logical formLearned from3 sentences. A koan can be a riddle.Logical formLearned from3 sentences. A poem can be a riddle.Logical formLearned from3 sentences.