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1 Peter should buy books whose prices are 3 and 4.
2
3 Peter should buy books whose prices are 70 and 206.
4
5 Peter should buy books whose prices are 103 and 219.
6
7 Peter should buy books whose prices are 156 and 252.
8
9 Peter should buy books whose prices are 102 and 479.
10
11 Peter should buy books whose prices are 67 and 93.
12
13 Peter should buy books whose prices are 5 and 6.
14
15 Peter should buy books whose prices are 194 and 375.
16