Brute force by group of symbols

How to do brute force if i know than password consist of strings(not only char)?

For example:
strings: 'vv', 'VV', '&'.

Iterations:
&vvVV
vv&VV
vvVV&
VVvv&

The main idea in the economy of time bruteforce.
I do not find anything in documentation: https://hashcat.net/wiki/doku.php?id=mask_attack