## 7x7x7 Rubic's Cube

 [7x7x7 Rubic's Cube](https://en.wikipedia.org/wiki/V-Cube_7) (aka V-Cube 7) is a larger version
of original 3x3x3 Rubic's cube.

Unlike the original version, the God's number for this cube is not known. The group size(number of states) of the 7x7x7 cube is around 1.95E+160 (for comparison 3x3x3 Rubik's cube has 4.3E+19 states).