The number, and alphanumeric denote the final position in the file destination.
Example template files:
FILENAME -> CONTENT
10ppp -> 1234
10ppr -> aaqq
20aaa -> 5544
05t -> tyuu
when expand, the content of each template file is pasted into the destination file in alphanumeric order of the template file name.
The content in the destination file you have:
tyuu
1234
aaqq
5544
This may be help you.
Sorry for my BADDD english