Quite near them, to the north, the creek bottoms lay below the prairie. Some darker green tree-tops showed, and beyond them (1)bits of the rim of earthen bluffs held up the prairie's grasses . Far away to the east, (2) a broken line of different greens lay on the prairie, and Pa said that was the river.
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bits of the rim of earthen bluffs held up the prairie's grassesBits of the rim ... supported the ... grasses (not impeded the progress of the ... grasses)