천자문
The "Thousand Character Classic" has its own form in representing the Chinese characters. For each character, the text shows its meaning (Korean Hanja: ; ' or ') and sound (Korean Hanja: ; '). The vocabulary to represent the ' has remained unchanged in every edition, despite the natural evolution of the Korean language since then. However, in the editions "Gwangju Thousand Character Classic" and "Seokbong Thousand Character Classic", both written in the 16th century, there are a number of different meanings expressed for the same character. The types of changes of "" in "Seokbong Thousand Character Classic" into those in "Gwangju Thousand Character Classic" fall roughly under the following categories: