tools/src/main/java/org/apache/pdfbox/tools/PDFText2HTML.java [320:373]:
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            appendEscaped(buffer, character);

            return buffer.toString();
        }

        private String open(String tag)
        {
            if (stateSet.contains(tag))
            {
                return "";
            }
            stateList.add(tag);
            stateSet.add(tag);

            return openTag(tag);
        }

        private String close(String tag)
        {
            if (!stateSet.contains(tag))
            {
                return "";
            }
            // Close all tags until (but including) the one we should close
            StringBuilder tagsBuilder = new StringBuilder();
            int index = closeUntil(tagsBuilder, tag);

            // Remove from state
            stateList.remove(index);
            stateSet.remove(tag);

            // Now open the states that were closed but should remain open again
            for (; index < stateList.size(); index++)
            {
                tagsBuilder.append(openTag(stateList.get(index)));
            }
            return tagsBuilder.toString();
        }

        private int closeUntil(StringBuilder tagsBuilder, String endTag)
        {
            for (int i = stateList.size(); i-- > 0;)
            {
                String tag = stateList.get(i);
                tagsBuilder.append(closeTag(tag));
                if (endTag != null && tag.equals(endTag))
                {
                    return i;
                }
            }
            return -1;
        }

        private String openTag(String tag)
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tools/src/main/java/org/apache/pdfbox/tools/PDFText2Markdown.java [236:289]:
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            appendEscaped(buffer, character);

            return buffer.toString();
        }

        private String open(String tag)
        {
            if (stateSet.contains(tag))
            {
                return "";
            }
            stateList.add(tag);
            stateSet.add(tag);

            return openTag(tag);
        }

        private String close(String tag)
        {
            if (!stateSet.contains(tag))
            {
                return "";
            }
            // Close all tags until (but including) the one we should close
            StringBuilder tagsBuilder = new StringBuilder();
            int index = closeUntil(tagsBuilder, tag);

            // Remove from state
            stateList.remove(index);
            stateSet.remove(tag);

            // Now open the states that were closed but should remain open again
            for (; index < stateList.size(); index++)
            {
                tagsBuilder.append(openTag(stateList.get(index)));
            }
            return tagsBuilder.toString();
        }

        private int closeUntil(StringBuilder tagsBuilder, String endTag)
        {
            for (int i = stateList.size(); i-- > 0;)
            {
                String tag = stateList.get(i);
                tagsBuilder.append(closeTag(tag));
                if (endTag != null && tag.equals(endTag))
                {
                    return i;
                }
            }
            return -1;
        }

        private String openTag(String tag)
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