Recall that for a grammar symbol $\backslash$alpha $,$ the set First$(\backslash$alpha $)$ designates the set of terminal symbols that can appear at the start of a sentence derived from $\backslash$alpha $.$ What are First$($Ra$),$ First$($Qba$),$ and First$($bbc$)$ in the grammar below?

L $->$ Ra $|$ Qba

R $->$ aba $|$ caba $|$ Rbc

Q $->$ bbc $|$ bc

Identify two issues with the above grammar that prevent it from admitting an LL$(1)$ parser.