Lesson one 1
Lesson two 12
Lesson three 20
Lesson four 30
Lesson five 38
Lesson six 47
Lesson seven 59
Lesson eight 67
Lesson nine 76
Lesson ten 84
Lesson eleven 92
Lesson twelve 102
Lesson thirteen 110
Lesson fourteen 120
Lesson fifteen 130
Lesson sixteen 140
Lesson seventeen 148
Lesson eighteen 156
Lesson nineteen 164
Lesson twenty 174