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Object[] array = elements;
if (array == null)
return;
for (int i = 0; i < array.length; i++) {
//don't share keys because they are already interned
for (int i = 1; i < array.length; i = i + 2) {
Object o = array[i];
if (o instanceof String)
array[i] = set.add((String)o);