Use heuristics to suggest alternative sequence of distillation for below mixture: $($Normal boiling point$/$molar flowrate$)$C$3(-420$C$)$: $310$ mol$/$hr; i$-$C$4(-11\mathrm{.}70$C$)$: $11892$ mol$/$hr; O$-$C$4(-6\mathrm{.}30$C$)$: $143$ mol$/$hr; n$-$C$4(-10$C$)$: $419$ mol$/$hr; i$-$C$8(990$C$)$: $918$ mol$/$hr and C$12(216\mathrm{.}20$C$)$: $184$ mol$/$hr$.$Do not split i$-$C$4$ from O$-$C$4$Should side stream column be considered