List the elements in each set. 67. {x|x is an even natural number less than 20}
68. {x | x is a natural number greater than 6}
69. {x|x is an odd natural number greater than 11}
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70. {x|x is an odd natural number less than 14}
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71. {x | x is an even natural number between 4 and 79}
72. {x|x is an odd natural number between 12 and 57}