code: private static int findIndex(String[] array, String target){
          for (int i = 0; i < array.length; i++) {
              if (target.equals(array[i])) {
                  return i;
              }
          }
          return -1;
      }
docs: linear search of the string array. the arrays are unfortunately ordered by the
  two-letter target code, not the three-letter search code, which seems backwards.