Notice how F and G are self-contained and do not connect to the other parts of the grammar, therefore, they are unreachable. I think it would be more informative to expose collections of ~S~CCs rather than single unreachable nonterminals.
Edit: correction, of course, I meant to say connected components, not strongly connected components.
As a response to your unreachable nonterminals comment:
I'm currently visualizing it like this:
Notice how F and G are self-contained and do not connect to the other parts of the grammar, therefore, they are unreachable. I think it would be more informative to expose collections of ~S~CCs rather than single unreachable nonterminals.
Edit: correction, of course, I meant to say connected components, not strongly connected components.