x = [[[[1],[2],[3],[4],[5],[6],[7],[8],[9],[10]]]]
print([x for x in x for x in x for x in x for x in x])
eCA9IFtbW1sxXSxbMl0sWzNdLFs0XSxbNV0sWzZdLFs3XSxbOF0sWzldLFsxMF1dXV0KcHJpbnQoW3ggZm9yIHggaW4geCBmb3IgeCBpbiB4IGZvciB4IGluIHggZm9yIHggaW4geF0p
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]