1, 10;
2, 20;
3, 30;
4, 40;
5, 50;
6, 60;
7, 70;
8, 80;
9, 90;
10, 15;
11, 25;
12, 35;
13, 45;
14, 55;
15, 65;
16, 75;
17, 85;
18, 95;