3. a) 1(4; 2), 2(4; 4), 3(3; 5), 4(-1; 5), 5(-2; 4), 6(-2; -5), 7(-1; -6), 8(3; -6), 9(4; -5), 10(4; -1), 11(3; 0), 12(0; 0),
13(0; 3), 14(2; 3), 15(2; 2), 16(2; -2), 17(2; -4), 18(0; -4),
19(0; -2);
6) 1(-1; 3), 2(-3; 3), 3(-3; 5), 4(-2; 6), 5(2; 6), 6(3; 5), 7(3; 2).
8(-1; -5), 9(-3; -5), 10(1; 2), 11(1; 4), 12(-1; 4).​