(Referenced by 918)

During her stay in Oxford, Kang KyoungNang 7d was not only so kind to help us with the very first moves of the problem; she also put us in contact with Professor Prof. Jeong SooHyun from Myongji University in Seoul.

We are very grateful that Prof. Jeong SooHyun, as well as his students, worked long and intensively on our solution, finally confirming that there doesn't seem to be any major problem within our sequence.

However, Prof. Jeong SooHyun also pointed out that two points should be corrected.