0
U1:
1-BACBC
2-TTFFT
3-FFTFF
U2:
1-DBABA
2-ABCBC
3-BDBAB
U3:
1-BACAA
2-CDCBD
3-CCBBA
U4:
1-TFTTF
2-CDCDC
3-单词题，略
U5:
1-TTFTF
2-简答题，略
3-ABDCC
4-BDAAD
U6:
1-FFTFT
2-CBADC
3-简答题，略
U7:
1-TFTFT
2-单词题，略
3-(4)
U8:
1-CACCA
2-AABCC
3-单词题，略
U9:
1-(2)(4)
2-TTTFF
3-单词题，略
U10:
1-CABED
2-TTFFT
3-简答题，略
U11:
1-CBACD
2-DABCD
3-CCBD
U12:
1-BACFGED
2-ABADC
3-简答题，略
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