I think the fact the deck doesn't have many repeats of 9s. It has lots of repeats of 5s which causes merges and the other numbers will eventually merge. You hav

I think the fact the deck doesn't have many repeats of 9s. It has lots of repeats of 5s which causes merges and the other numbers will eventually merge. You have 4 each of 6,7,8,9. If you repeat 9 4 times there will be no more 9's and it will merge.