\begin{center}
\begin{forest} for tree={edge path={\noexpand\path[\forestoption{edge}] (\forestOve{\forestove{@parent}}{name}.parent anchor) -- +(0,-12pt)-| (\forestove{name}.child anchor)\forestoption{edge label};} }
[Start
[g
[d [E] [a [X] [c [O] [p [C] [S] ] ] ] ]
[j
[k [f [m [P] [N] ] [o [V] [n [R] [b [H] [m [K] [U] ] ] ] ] ] [i [f [M] [I [B] [W] ] ] [F] ] ]
[i [f [Q] [e [T] [h [L] [D] ] ] ] [I [h [Y] [I] ] [e [G] [A] ] ] ] ] ] ]
\end{forest}
\end{center}