2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20A X XB X X XC X...
Câu
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
A
X
X
B
X
X
X
C
X
X
X
X
X
D
X
X
X
X
Câu
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
A
X
X
B
X
X
X
C
X
X
X
X
X
D
X
X
X
X