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static TreeSet litciset(S... items) { TreeSet set = caseInsensitiveSet(); for (S a : items) set.add(a); ret set; } ifclass Symbol static TreeSet litciset(Symbol... items) { TreeSet set = treeSet(); // HashSet would also do, but we might have the return type fixed somewhere, and they might want a NavigableMap. for (S a : items) set.add(a); ret set; } endif