> Before
> After
:g1:a -> :g1
:g2 -> :g2:a
:g3:g2:a -> :g3
:g4 -> :g4:g2:a
:g5:g2:a -> :g5
:g5:g2:b -> :g5
:g6 -> :g6:g2:a
:g6 -> :g6:g2:b
