Help with Mask

[ry2019]

Hi all, is it possible to run a brute force attack / mode 0 using increment min/max AND appending 3 known characters to the end? e.g


abcdef123
abcdefg123
abcdefgh123

I've tried to find ways to achieve it and checked the manual but haven't had any luck so far
I can use masks to try different lengths by trial and error with the 3 characters at the end e.g. ?l?l?l?l321, but it would be great if I could try all combinations of ?l to check for different numbers of letters before the known 3 characters at the end

Thanks!