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994 carboxyamidomethylation chiu tzu chi lyre-shaped Mahgawān metallic surface mushroom ventilator normal two-sample problem Ostwald's ripening outpolar conic pipe insulating purified helium compressor with integral intercool serpentinizations set the best foot forward solvent vapo(u)r stop presses Ta-Hsai trouble shooting progarm velocity head flowmeter volumetric table