$($a$)$Consider the algorithm Quicksort given in Appendix H$.[$You may assume that the Partition function used is $\backslash (\backslash$mathrm$\{$O$\}(\backslash$mathrm$\{$n$\})]\backslash ).$

$($i$)$Let $\backslash (\backslash$mathrm$\{$L$\}=\backslash \{21,15,34,65,12,7,29\backslash \}\backslash ).$Use L to illustrate how Quicksort works.