maskprocessor - how to combine letters and numbers?

[wm552]

sorry for such question, can't understand how to combine letters and numbers in single dictionary - I need 7 characters, lowercase + uppercase + numbers - no more than 3 sequental and no more than 4 multiple, for eg 1aaa2aB, pls help!

[philsmd]

-1 ?l?u?d -q 4 -r 5 ?1?1?1?1?1?1?1

[wm552]

-1 ?l?u?d -q 4 -r 5 ?1?1?1?1?1?1?1

thank you much bro, really lost how to deal with this math