Khó.

1

#1. 

2

#2 

3

#3 

4

#4 

5

#5 

6

#6 

7

#7 

8

#8 

9

#9 

10

#10 

11

#11 

12

#12 

13

#13 

14

#14 

15

#15 (ngược) 

16

#16. 

17

#17 

18

#18 

19

#19 (h+) 

20

#20 H+ 

21

#21 

22

#22 

23

#23 

24

#24 

25

#25 

26

#26 

27

#27 

28

#28 

29

#29 

30

#30 

31

#31 

32

#32 

33

#33 

34

#34 

35

#35 

36

#36 

37

#37 

38

#38 

39

#39 

40

#40 

41

#41 

42

#42 

43

#43 

44

#44 

45

#45 

46

#46 

47

#47 

48

#48 

49

#49 

50

#50 

51

#51 

52

#52 

53

#53 

54

#54 

55

#55 

55

#55 

54

#54 

53

#53 

52

#52 

51

#51 

50

#50 

49

#49 

48

#48 

47

#47 

46

#46 

45

#45 

44

#44 

43

#43 

42

#42 

41

#41 

40

#40 

39

#39 

38

#38 

37

#37 

36

#36 

35

#35 

34

#34 

33

#33 

32

#32 

31

#31 

30

#30 

29

#29 

28

#28 

27

#27 

26

#26 

25

#25 

24

#24 

23

#23 

22

#22 

21

#21 

20

#20 H+ 

19

#19 (h+) 

18

#18 

17

#17 

16

#16. 

15

#15 (ngược) 

14

#14 

13

#13 

12

#12 

11

#11 

10

#10 

9

#9 

8

#8 

7

#7 

6

#6 

5

#5 

4

#4 

3

#3 

2

#2 

1

#1. 