their final exams? Note that in the graph, the vertices are classes and the edges represent classes that are shared by someone.

$\backslash$begin$\{$tabular$\}\{|$c$|$c$|\}$

$\backslash$hline Alfred & History, Computers, Skiing $\backslash \backslash$

$\backslash$hline Mr$.$ Fantastic & Spanish, Skiing, Computers $\backslash \backslash$

$\backslash$hline Gambit & Business, History, Spanish $\backslash \backslash$

$\backslash$hline Iceman & Skiing, Business, Physics $\backslash \backslash$

$\backslash$hline Logan & Physics, Spanish, Computers $\backslash \backslash$

$\backslash$hline Cat Woman & Computers, Spanish, History $\backslash \backslash$

$\backslash$hline Hulk & Computers, Spanish, Astronomy $\backslash \backslash$

$\backslash$hline

$\backslash$end$\{$tabular$\}$

In the following table, indicate in which final exam time each class could be placed $($i$.$e$.1,2,$ etc$).$

$\backslash$begin$\{$tabular$\}\{|$l$|$l$|\}$

$\backslash$hline$\backslash (\backslash$square $\backslash )$ & Computers $\backslash \backslash$

$\backslash$hline$\backslash (\backslash$square $\backslash )$ & Physics $\backslash \backslash$

$\backslash$hline$\backslash (\backslash$square $\backslash )$ & History $\backslash \backslash$

$\backslash$hline$\backslash (\backslash$square $\backslash )$ & Skiing $\backslash \backslash$

$\backslash$hline$\backslash (\backslash$square $\backslash )$ & Astronomy $\backslash \backslash$

$\backslash$hline$\backslash (\backslash$square $\backslash )$ & Spanish $\backslash \backslash$

$\backslash$hline$\backslash (\backslash$square $\backslash )$ & Business $\backslash \backslash$

$\backslash$hline

$\backslash$end$\{$tabular$\}$