ser2intser2p1ser2p2ser2p3ser2p4
2.1
2-12-22-32-42-52-62-72-8
2.2
3-1w3-2w3-3w3-4w3-5w3-6w
2.3
4-1f4-2f4-3f4-4f4-5f4-6f
2.4
5-15-25-35-45-55-65-7
2.5
6-16-26-36-46-5
2.6
7-17-27-37-47-57-67-77-87-9
2.7
8-18-28-38-4a8-58-6
2.8
9-19-29-39-59-6
2.9
10-210-310-410-510-610-710-8
2.10
11-111-211-311-4
2.11
12-112-212-312-4
2.12
13-113-213-313-413-513-613-7
2.13
14-114-214-314-4
2.14
15-1a15-215-315-415-5
2.15
16-116-216-316-4
2.16
chap2qanda
2.QA