edef s1 = set {4,2,6,7,3,8};
s1.ord(7);
s1.ord(17);
s1.first;
s1.last;
s1.next(s1.first);
s1.prev(s1.last);
s1.next(s1.last);
s1.prev(s1.first);
s1.nextc(s1.last);
s1.prevc(s1.first);
s1.size;
s1.copy;

edef s2 = set {"a", "b", "c" };
s2.ord("b");
s2.ord("z");
s2.first;
s2.last;
s2.next(s2.first);
s2.prev(s2.last);
s2.next(s2.last);
s2.prev(s2.first);
s2.nextc(s2.last);
s2.prevc(s2.first);
s2.size;
s2.copy;

edef s3 = set { 1.2, 3.4, 5.6, 7.8};
s3.ord(3.4);
s3.ord(3.14);
s3.first;
s3.last;
s3.next(s3.first);
s3.prev(s3.last);
s3.next(s3.last);
s3.prev(s3.first);
s3.nextc(s3.last);
s3.prevc(s3.first);
s3.size;
s3.copy;

