How to emulate 3 dictionaries?

Hi there,
I know how to use 2 dictionaries, but I need to use 3.
I cannot just merge 2 dictionaries into 1, because that would create files as huge as 100 GB.
Perhaps I can use masks? So it would be something like:

cudahashcat64.exe {dictionary1}{dictionary2}{constant_postfix1}
cudahashcat64.exe {dictionary1}{dictionary2}{constant_postfix2}
cudahashcat64.exe {dictionary1}{dictionary2}{constant_postfix3}

so I would just convert the third cdictionary into postfixes. Can I do something like this?