Week 2-Jan 22 (In[tro]duction, 0): Ch 0: 25, 24, 7, 14, 19, 21
Week 3-Jan 29 (Groups, 1+5): Ch 1: 6, 13. Ch 5: 6,8, 19, 43
Week 4-Feb 5 (Sub-, cyclic, solvable groups, 3+4+32): Ch3: 4,10,11,46,48. Ch4: 9,19,63
