Lines of single_doc/卡组测试教程.md from check-in 3f356dbfe7 that are changed by the sequence of edits moving toward check-in 5820fafa40:

                         1: <details>
                         2: <summary>
                         3: 前言
                         4: </summary>
                         5: 有人想用残局，进行卡组测试。
                         6: 
                         7: 鄙人在此提供些微帮助。
                         8: </details>