A trail can be at a lake.Logical formLearned from7 sentences. Some trails can be for walking.Logical formLearned from7 sentences. Obstacles can be on a trail.Logical formLearned from7 sentences. A segment can be constituted-of-or-filled-with trail.Logical formLearned from7 sentences. A trail may stretch some miles.Logical formLearned from7 sentences. (Meteor trails) can be ionized.Logical formLearned from7 sentences. Trails can be twisted.Logical formLearned from7 sentences. Machines may have a (paper trail).Logical formLearned from7 sentences. A person may go_out on a trail.Logical formLearned from7 sentences. Trails may be followed.Logical formLearned from7 sentences. Trails can be on public lands.Logical formLearned from7 sentences. A (paper trail) can be reliable.Logical formLearned from7 sentences. (Trail projects) can be recreational.Logical formLearned from7 sentences. Sections can be constituted-of-or-filled-with trails.Logical formLearned from7 sentences. (Trail uses) can be motorized.Logical formLearned from7 sentences.