COPYRIGHT

Blast bug fix: now always duplicates when applying a haz rule,
whether or not new variables are added.

Can now prove theorems such as these:

val prems = Goal "[|P==>Q; P==>~Q|] ==> ~P";
by (blast_tac (claset() addDs prems) 1);

val prems = Goal "[|Q==>P; ~Q==>P|] ==> P";
by (blast_tac (claset() addIs prems) 1);

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