Two distillation columns, which are overseen by engineers Gianna and Peter, separate three components. A liquid mixture enters the first column at $536k\frac{g}{s}$ and contains $35\mathrm{.}0$ mass $\%$ ethanol $(C_2($:$H_{5}OH\}$ mass $\%$ propanol $(C_3{H}_{7}OH),$ and the balance butanol $(C_4{H}_{9}OH).$ The bottom product stream of the first column contains $93\mathrm{.}1$ mass $\%$ B and no $E,$ and $96\mathrm{.}2\%$ of the $B$ in the feed stream is recovered in the bottom product stream. The overhead product of the first column is used as the feed stream to the second column. The overhead product from the second column contains $94\mathrm{.}3\%$ of the $E$ in the feed to this column. The composition of the overhead product stream is $91\mathrm{.}5$ mass $\%E$ and the balance $P.$

After drawing and labeling a process flow diagram, including numbering of each stream and labeling components $($ethanol$=$E$,$ propanol$=$P$,$ butanol$=$B$)$ present in each stream, answer the following question.

How many components enter in the second distillation column?