1- Collapse the bottom right string with a purple sphere.
2- Collapse the bottom left string with a red sphere.
3- Switch the blue color to white color.
4- Collapse the left string with a purple sphere.
5- Collapse the upper left string with a red sphere.
6- Switch the white color to yellow color.
7- Switch the yellow color to red color.
8- Eliminate the bottom right string with a red sphere.
9- Eliminate the upper string with a purple sphere (the red ones will collapse).