Some ridges can be behind an university.Logical formLearned from8 sentences. A ridge can be sharp.Logical formLearned from8 sentences. Positions can be on a (ridge west) of a river.Logical formLearned from8 sentences. Bombers may circle over a ridge.Logical formLearned from8 sentences. Forces may be positioned on ridges.Logical formLearned from8 sentences. Ridges may pertain-to a fingerprint.Logical formLearned from8 sentences. A (mountain ridge) can be vital.Logical formLearned from8 sentences. Ridges can be constituted-of-or-filled-with debris.Logical formLearned from7 sentences. Images may show ridges.Logical formLearned from7 sentences. Ridges may be found.Logical formLearned from7 sentences. A series can be constituted-of-or-filled-with (mountain ridges).Logical formLearned from7 sentences. Ridges can be subsidiary.Logical formLearned from7 sentences. A group can be constituted-of-or-filled-with ridges.Logical formLearned from7 sentences. Ridges can be barren.Logical formLearned from7 sentences. A system can be constituted-of-or-filled-with mid-ocean ridges.Logical formLearned from7 sentences.