+static int ORaction(struct nexus *n, FILE *fp, int msgnum,
+ long start, long stop);
+static int ANDaction(struct nexus *n, FILE *fp, int msgnum,
+ long start, long stop);
+static int NOTaction(struct nexus *n, FILE *fp, int msgnum,
+ long start, long stop);
+static int GREPaction(struct nexus *n, FILE *fp, int msgnum,
+ long start, long stop);
+static int TWSaction(struct nexus *n, FILE *fp, int msgnum,
+ long start, long stop);