A stone may disappear.Logical formLearned from15 sentences. Music may pertain-to stones.Logical formLearned from15 sentences. A stone can be heart-shaped.Logical formLearned from15 sentences. Groups can be constituted-of-or-filled-with stones.Logical formLearned from15 sentences. (Stone steps) may lead.Logical formLearned from15 sentences. Flights can be constituted-of-or-filled-with (stone steps).Logical formLearned from15 sentences. Stones may undergo collections.Logical formLearned from15 sentences. Some stones may be found.Logical formLearned from15 sentences. Use may cause (kidney stones).Logical formLearned from15 sentences. Stones may heal qualities.Logical formLearned from15 sentences. A stone may be cuted.Logical formLearned from15 sentences. Thousands of children may fall with (kidney stones).Logical formLearned from15 sentences. A stone may be lost.Logical formLearned from15 sentences. Stones can be cold.Logical formLearned from15 sentences. Stones may be took.Logical formLearned from15 sentences.