Practise proofs

87.

86.

21.

22.

23.

24.

25.

27.

28.

36.

78.

31.

35.

52.

51.

53.

54.

56.

57.

58.

59.

61.

82.

85.

69.

70.

71.

72.

73.

74.

75.

76.

77.

79.

43.



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