A hold can be on ridges.Logical formLearned from2 sentences. A material may form ridges.Logical formLearned from2 sentences. Ridges can be constituted-of-or-filled-with sandstone.Logical formLearned from2 sentences. Hills can be (sand ridges).Logical formLearned from2 sentences. Ridges may correspond to a number of sections.Logical formLearned from2 sentences. Ridges can be apparent.Logical formLearned from2 sentences. Ridges can be on ledges.Logical formLearned from2 sentences. Ridges can be with hollows.Logical formLearned from2 sentences. Ridges may be extended on some sides.Logical formLearned from2 sentences. Hollows may be separated by ridges.Logical formLearned from2 sentences. A portion may be composed of a network of ridges.Logical formLearned from2 sentences. Ridges can be with pits.Logical formLearned from2 sentences. Ridges can be between cusps.Logical formLearned from2 sentences. Features may resemble ridges.Logical formLearned from2 sentences. Descent can be from ridges.Logical formLearned from2 sentences.