An activity can be (coal pile operation).Logical formLearned from2 sentences. A trench can be on north sides of a (coal pile).Logical formLearned from2 sentences. North sides may pertain-to a (coal pile).Logical formLearned from2 sentences. An outfall can be for a (coal pile storage area runoff collection system overflow line).Logical formLearned from2 sentences. Persons may pour some pile of sand.Logical formLearned from2 sentences. Persons may pour a pile of sand.Logical formLearned from2 sentences. (Rainbow piles) can be constituted-of-or-filled-with sweaters.Logical formLearned from2 sentences. Piles of trash may go uncollected.Logical formLearned from2 sentences. Piles can be constituted-of-or-filled-with (tin cans).Logical formLearned from2 sentences. A pile of stones may lie-flat beside a hole.Logical formLearned from2 sentences. A room may be furnished by piles of pails.Logical formLearned from2 sentences. Plans may hold a pile of manuscript.Logical formLearned from2 sentences. Piles can be in water.Logical formLearned from2 sentences. A pile may undergo a survey.Logical formLearned from2 sentences. Some towns may rest on piles.Logical formLearned from2 sentences.