| simplify; intros;
cases (b2pT ? ? (andbPF ? ?) (p2bT ? ? (negbP ?) H)); clear H;
[ intros; lapply (b2pF ? ? (eqP d ? ?) H1) as H'; clear H1;
| simplify; intros;
cases (b2pT ? ? (andbPF ? ?) (p2bT ? ? (negbP ?) H)); clear H;
[ intros; lapply (b2pF ? ? (eqP d ? ?) H1) as H'; clear H1;