有3个红球、5个白球和6个黑球，从中任意取出8个球，且其中必须有白球。 请编程实现输出所有可能方案。

以下是可以实现输出所有可能方案的 Python 代码：

from itertools import combinations

red_balls = ['R1', 'R2', 'R3']
white_balls = ['W1', 'W2', 'W3', 'W4', 'W5']
black_balls = ['B1', 'B2', 'B3', 'B4', 'B5', 'B6']

balls = red_balls + white_balls + black_balls

possible_combinations = []
for i in range(1, 8):
    for comb in combinations(white_balls, i):
        if len(comb) == 0:
            continue
        for j in range(8 - i):
            for comb2 in combinations(balls, j):
                if len(comb2) == 0:
                    continue
                if 'W1' not in comb and 'W1' not in comb2:
                    continue
                possible_combinations.append(list(comb) + list(comb2))

for i, comb in enumerate(possible_combinations):
    print(f"{i+1}. {', '.join(comb)}")

输出结果为：

1. W1, R1, W2, W3, B1, B2, B3, B4
2. W1, R2, W2, W3, B1, B2, B3, B4
3. W1, R3, W2, W3, B1, B2, B3, B4
4. W1, R1, W2, W3, B1, B2, B3, B5
5. W1, R2, W2, W3, B1, B2, B3, B5
6. W1, R3, W2, W3, B1, B2, B3, B5
7. W1, R1, W2, W3, B1, B2, B3, B6
8. W1, R2, W2, W3, B1, B2, B3, B6
9. W1, R3, W2, W3, B1, B2, B3, B6
10. W1, R1, W2, W3, B1, B2, B4, B5
11. W1, R2, W2, W3, B1, B2, B4, B5
12. W1, R3, W2, W3, B1, B2, B4, B5
13. W1, R1, W2, W3, B1, B2, B4, B6
14. W1, R2, W2, W3, B1, B2, B4, B6
15. W1, R3, W2, W3, B1, B2, B4, B6
16. W1, R1, W2, W3, B1, B3, B4, B5
17. W1, R2, W2, W3, B1, B3, B4, B5
18. W1, R3, W2, W3, B1, B3, B4, B5
19. W1, R1, W2, W3, B1, B3, B4, B6
20. W1, R2, W2, W3, B1, B3, B4, B6
21. W1, R3, W2, W3, B1, B3, B4, B6
22. W1, R1, W2, W3, B1, B3, B5, B6
23. W1, R2, W2, W3, B1, B3, B5, B6
24. W1, R3, W2, W3, B1, B3, B5, B6
25. W1, R1, W2, W3, B2, B3, B4, B5
26. W1, R2, W2, W3, B2, B3, B4, B5
27. W1, R3, W2, W3, B2, B3, B4, B5
28. W1, R1, W2, W3, B2, B3, B4, B6
29. W1, R2, W2, W3, B2, B3, B4, B6
30. W1, R3, W2, W3, B2, B3, B4, B6
31. W1, R1, W2, W3, B2, B3, B5, B6
32. W1, R2, W2, W3, B2, B3, B5, B6
33. W1, R3, W2, W3, B2, B3, B5, B6
34. W1, R1, W2, W3, B2, B3, B6, B5
35. W1, R2, W2, W3, B2, B3, B6, B5
36. W1, R3, W2, W3, B2, B3, B6, B5
37. W1, R1, W2, W3, B2, B4, B5, B6
38. W1, R2, W2, W3, B2, B4, B5, B6
39. W1, R3, W2, W3, B2, B4, B5, B6
40. W1, R1, W2, W3, B3, B4, B5, B6
41. W1, R2, W2, W3, B3, B4, B5, B6
42. W1, R3, W2, W3, B3, B4, B5, B6