+ * Revision 1.10 1995-09-06 16:10:57 adam
+ * More work on boolean sets.
+ *
+ * Revision 1.9 1994/09/28 16:58:26 quinn
+ * Small mod.
+ *
+ * Revision 1.8 1994/09/28 12:56:09 quinn
+ * Added access functions (ISPT)
+ *
+ * Revision 1.7 1994/09/28 11:56:13 quinn
+ * Removed const from input to is_merge
+ *
+ * Revision 1.6 1994/09/28 11:29:28 quinn
+ * Added cmp parameter.
+ *
+ * Revision 1.5 1994/09/27 20:03:36 quinn
+ * Seems relatively bug-free.
+ *
+ * Revision 1.4 1994/09/26 17:05:54 quinn
+ * Trivial.
+ *
+ * Revision 1.3 1994/09/26 16:08:42 quinn