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Coupon materials consisted of railcar carpet (A), Mylar® (B), aluminum seat back (C), rubber flooring (D), new railcar air filter (E), used railcar air filter (F), fiberglass interior siding (G), upholstery (H), new grease with spores mixed (I), new grease SOT (J), used grease SOT (K), unpainted concrete (L), new industrial carpet (M).
