(QRY) 4
 (TXT) c-lesson1.txt
 (QRY) 4
 (TXT) c-lesson2.txt
 (QRY) 4
 (TXT) c-lesson3.txt
 (QRY) 4
 (TXT) c-lesson4.txt
 (QRY) 4
 (TXT) c-lesson5.txt
 (QRY) 4
 (TXT) c-lesson6.txt
 (QRY) 4
 (TXT) c-lesson7.txt
 (QRY) 4
 (TXT) c-lesson8.txt
 (QRY) 4
 (TXT) c-lesson9.txt
 (ERR)