(a) 1, 5, 7, 11
1+5+7 = 13
1+5+11=17
1+7+11=19
5+7+11=23
(a) 1, 5, 7, 11
1+5+7 = 13
1+5+11=17
1+7+11=19
5+7+11=23
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