 $\al_{00}=\al_0-0-b >0$, $\al_{00}=0$, $\al_{00}=0$, $\al_{00}=0$, $\al_{00}=\al_0-0$, $\al_{00}=0,$ $\al_{00}=a$, $\al_{00}=0$, $\al_{00}=\al_0-0$, $\al_{00}=\al_0-0-a$, $\al_{00}=b$, $\al_{00}=0.$  