The format for the lecture videos relates to Chapter number encompassed e.g. 02_03 means lecture span from ch2 to ch3. The last 2 digits relate to the lecture number
CH_02_03_LECTURE_01
CH_02_04_LECTURE_02
CH_03_04_LECTURE_03
CH_03_04_LECTURE_04
CH_03_04_LECTURE_05
CH_05_06_LECTURE_06
CH_05_06_LECTURE_07
CH_05_06_LECTURE_08
CH_07_08_LECTURE_09
CH_07_08_LECTURE_10
EXAM_2_REVIEW
CH_09_LECTURE_11
CH_09_LECTURE_12
CH_09-10_LECTURE_13
CH_10-11_LECTURE_14
CH_10-11_LECTURE_15
CH_10-11_LECTURE_16
CH_15_LECTURE_17
CH_13_LECTURE_18
EXAM_3_REVIEW
CH_13_LECTURE_20
CH_14_LECTURE_21
CH_14_LECTURE_22