5 CACBB
10 BCBAC
11~15 BACCA
16~20 CACBC
21~25 BADCB
26~30 CADBC
31~35 CDCDD
36~40 BBCDA
41~45 DDBCB
46~50 CBACB
51~55 BCABA
56~60 ADCAD
61~65 CCACD
66~70 BBCAD
71 not to drive
72 where l am beginning to
73 of which l feel
74 where/in which they can communicate with
75 (who/whom)you just talked to/to whom you just talked
76 getting up / he gets up
77 when the hill was covered with
78 did l realize(that)
79 several of whom came from
80 why he was so upset