code: private static void initComplementMap() {
  		complementMap = new HashMap<String, String>();
  		complementMap.put("A", "U");
  		complementMap.put("G", "C");
  		complementMap.put("C", "G");
  		complementMap.put("U", "A");
  		complementMap.put("T", "A");
  		complementMap.put("X", "X");
  	}
docs: initialize Map to get the complement of each nucleotide