Rules or mask understanding (Specify number of chars/numbers)

[matrucious]

Hi!

I'm having some issue trying to understand the rules/masks.

What I'm looking for is a mask that has all lowercase chars, and numbers. The length of the password is 8, and the split of chars and numbers is 6 chars, and 2 numbers.

Now for the orientation, which is where I'm struggling: The two numbers can be anywhere.
Meaning the password can be any permutation of this:
aaaaaa00 -> 00aaaaaa [for example aa0a0aaa, or a0aaaa0a]

Now I'm having a hard time trying to get this to work.
I have a -1 ?l?d, and if i use the mask ?1?1?1?1?1?1?1?1 i would obviously get a giant data set that can have more or less than 2 numbers.

The passwords I'm trying to reach specifically (to avoid confusion) is something like these;
u99hauad
en3dtd7y
1m8hnmkw

Can anyone help me understand how to either fix the mask to my needs, or explain how a rule might fix this problem?

Thanks