Entering Code for [If cell (a1) is white, cell (a2:a3) is yellow and cell (a4) is white]

Hi there,
I have a situation and I need help.
Pardon my English for it is my second language.

Situation:
Given (23R x 4C) x 1000 where each cell contain random numbers and only two (2) background color (yellow and green).
I need a solution (code or any resolution) to all of these conditions:

Conditions:
1. If cell (a1) is yellow, cell (a2:a4) is white then cell (a1:a4) is white.
2. If cell (a1) is white, cell (a2) is yellow, cell (a3:a4) is white then cell (a2:a4) is white.
3. If cell (a1:a2) is white, cell (a3) is yellow, then cell (a1:a4) is white.
4. If cell (a1:a3) is white and cell (a4) is yellow then cell (a1:a4) is white.
5. If cell (a1:a2) is yellow then cell (a1:a4) remain the same color.
6. If cell (a1) is yellow, cell (a2) is white, cell (a3) is yellow then cell (a1:a4) remain the same color.
7. If cell (a1) is yellow, cell (a2:a3) is white and cell (a4) is yellow then cell (a1:a4) remain the same color.
8. If cell (a1) is white, cell (a2:a3) is yellow and cell (a4) is white then cell (a1:a4) remain the same color.
9. If cell (a1) is white, cell (a2) is yellow, cell (a3) is white and cell (a4) is yellow then cell (a1:a4) remain the same color.
10. If cell (a1:a2) is white and cell (a3:a4) is yellow then cell (a1:a4) remain the same color.
11. If cell (a1:a3) is yellow then cell (a1:a4) remain the same color.
12. If cell (a2:a3) is yellow, cell (a3) is white and cell (a4) is yellow then cell (a1:a4) remain the same color.
13. If cell (a1) is yellow, cell (a2) is white and cell (a3:a4) is yellow then cell (a1:a4) remain the same color.
14. If cell (a1) is white and cell (a2:a4) is yellow then cell (a1:a4) remain the same color.
15. If cell (a1:a4) is yellow then cell (a1:a4) remain the same color.

(Take note that all of these conditions are in yellow and white background)

Reverse Situation: Another condition is taking the entire conditions above and changing yellow to green and the results are the same which is: cell (a1:a4) remain the same color.

16. If cell (a1) is yellow and cell (a2) is green then cell (a1:a4) remain the same color
17. If cell (a1) is yellow, cell (a2) is white, cell (a3) is green and cell (a4) is white then cell (a1:a4) remain the color.
18. If cell (a1) is yellow, cell (a2:a3) is white and cell (a4) is green then cell (a1:a4) remain the same color.
19. If cell (a1) is white, cell (a2) is yellow, cell (a3) is green and cell (a4) is white then cell (a1:a4a) remain the same color.
20. If cell (a1) is white, cell (a2) is yellow, cell (a3) is white and cell (a4) is green then cell (a1:a4) remain the same color.
21. If cell (a1) is green, cell (a2) is yellow and cell (a3:a4) is white then cell (a1:a4) remain the same color.
22. If cell (a1:a2) is white, cell (a3) is yellow and cell (a4) is green then cell (a1:a4) remain the same color.
23. If cell (a1) is green, cell (a2) is white, cell (a3) is yellow and cell (a4) is white then cell (a1:a4) remain the same color.
24. If cell (a1) is white, cell (a2) is green, cell (a3) is yellow and cell (a4) is white then cell (a1:a4) remain the same color.
25. If cell (a1) is green, cell (a2:a3) is white and cell (a4) is yellow then cell (a1:a4) remain the same color.
26. If cell (a1) is white, cell (a2) is green, cell (a3) is white and cell (a4) is yellow then cell (a1:a4) remain the same color.
27. If cell (a1:a2) is white, cell (a3) is green and cell (a4) is yellow then cell (a1:a4) remain the same color.
28. If cell (a1:a2) is yellow, cell (a3) is green and cell (a4) is white then cell (a1:a4) remain the same color.
29. If cell (a1:a2) is yellow, cell (a3) is white and cell (a4) is green then cell (a1:a4) remain the same color.
30. If cell (a1) is yellow, cell (a2) is white, cell (a3) is yellow and cell (a4) is green then cell (a1:a4) remain the same color.
31. If cell (a1) is white, cell (a2:a3) is yellow and cell (a4) is green then cell (a1:a4) remain the same color.
32. If cell (a1) is green, cell (a2) is white, cell (a3:a4) is yellow then cell (a1:a4) remain the same color.
33. If cell (a1) is yellow, cell (a2) is green, cell (a3) is white and cell (a4) is yellow then cell (a1:a4) remain the same color.
34. If cell (a1:a3) is yellow and cell (a4) is green then cell (a1:a4) remain the same color.
35. If cell (a1:a2) is yellow, cell (a3) is green and cell (a4) is yellow then cell (a1:a4) remain the same color.
36. If cell (a1) is yellow, cell (a2) is green and cell (a3:a4) is yellow then cell (a1:a4) remain the same color.
37. If cell (a1) is green and cell (a2:a4) is yellow then cell (a1:a4) remain the same color.

Reverse Situation: Another condition is taking the entire conditions above and interchange the two different color (yellow to green) and the result is the same which is: cell (a1:a4) is white.

I hope to make things clearer, I have attached a Microsoft Excel file for you to identify the problems.