а) (1 и 2);(2 и 4); (3 и 6); (4 и 8); (5 и 10); (6 и 12); (7 и 14)
б) (1 и 3); (2 и 6); (3 и 9); (4 и 12); (5 и 15)
в) (1 и 7); (2 и 8); (3 и 9); (4 и 10); (5 и 11); (6 и 12); (7 и 13); (8 и 14);
(9 и 15)
г)(1 и 5); (2 и 6); (3 и 7); (4 и 8); (5 и 9); (6 и 10); (7 и 11); (8 и 12); (9 и 13)
(10 и 14); (11 и 15)
а) (1 и 2);(2 и 4); (3 и 6); (4 и 8); (5 и 10); (6 и 12); (7 и 14)
б) (1 и 3); (2 и 6); (3 и 9); (4 и 12); (5 и 15)
в) (1 и 7); (2 и 8); (3 и 9); (4 и 10); (5 и 11); (6 и 12); (7 и 13); (8 и 14);
(9 и 15)
г)(1 и 5); (2 и 6); (3 и 7); (4 и 8); (5 и 9); (6 и 10); (7 и 11); (8 и 12); (9 и 13)
(10 и 14); (11 и 15)