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Sandstone : Limestone : Coal
They are formed by metamorphic rocks.
They are chemical minerals.
They are found in river beds.
They are formed in sedimentary rocks.
Ostrich is related to antelope in the same way egret is related to
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Mundas : Gaddis : Shompens
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Gram : Grain : Pound
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Preamble : Constitution
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Grain : Salt