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static Map renameKeys(Map map, O... renames) { Map m2 = cloneMap(map); for (int i = 0; i+1 < l(renames); i += 2) { O o = map.get(renames[i]); if (o != null) { m2.remove(renames[i]); m2.put(renames[i+1], o); } } ret m2; }