\begin{cases}
First line\\
Second line\\
third line\\
\vdots
\end{cases}
Instead of the left open brace, if I want an Arrow mark, how I can do it?
One way is this,
$\left\uparrow \begin{array}{l}
First line\\
Second line\\
third line\\
\vdots
\end{array}
\right.$
which gives like
But the arrow is looking thin..I want a thick(may be ultrathick and in some colors) arrow.
If there is any other shapes I can draw means i will be happy..
How to do that??
After getting some comments, I am linking this question, which also narrates my problem.




