1.
a s
6 0
5 6
4 11
3 15
2 18
1 20
0 21
2.
a b
56 77
-21 77
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Answers & Comments
1.
a s
6 0
5 6
4 11
3 15
2 18
1 20
0 21
2.
a b
56 77
-21 77