...So much headache for this:
I just take "hamburgers" step by step with cursor and think about this:
0h1 1a2 2m3 3b4 4u5 5r6 6g7 7e8 8r9 9s10
Also at half of the word I got stucked. And I repeated procedure in mind
Even now I can't think clear about this concept. It just give me headache to think about second number.