The following stream at \(100^{\circ} \mathrm{F}\) and \(20 \mathrm{psia}\) is to be separated into the four indicated products. Determine the best distillation sequence by the heuristics of Section 9.4. Compare your result with that obtained by applying the Marginal Vapor Rate method.

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Species Feed (lbmol/hr) Product Product Product Product 1 2 3 4 Benzene 100 98 Toluene 100 98 Ethylbenzene 200 98 p-Xylene 200 98 m-Xylene 200 98 o-Xylene 200 98