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There are five boxes in front of you: white, black, red, blue and green. Also there are two balls for each of the colors. In each box there are two balls, and the colors of the box and balls may not coincide. It is also known that:
1. No ball lies in a box of the same color as it is;
2. There are no blue balls in the red box;
3. In a box of neutral color (that is, white or black) there is one red and one green ball;
4. In a black box there are balls of cold tones (green and blue colors);
5. In one of the boxes lie one white and one blue ball;
6. In the blue box is one black ball.
What color are the balls in each box?

Answer:

White Case Red and Green
Black jacket Green and Blue
Green Case White and Blue
Blue Case Black and Red
Red Case White and Black