code: SingleProofreadingError[] getFromPara(int numberOfParagraph,
                int startOfSentencePosition, int endOfSentencePosition) {
      for (CacheEntry anEntry : entries) {
        if (anEntry.numberOfParagraph == numberOfParagraph) {
          List<SingleProofreadingError> errorList = new ArrayList<>();
          for (SingleProofreadingError eArray : anEntry.errorArray) {
            if (eArray.nErrorStart >= startOfSentencePosition && eArray.nErrorStart < endOfSentencePosition) {
              errorList.add(eArray);
            }
          }
          return errorList.toArray(new SingleProofreadingError[0]);
        }
      }
      return null;
    }
docs: get Proofreading errors of sentence out of paragraph matches from cache