any tools to generate masks?

hi every1,
i was wondering if any 1 knows if their is a tool that allow u to generate mask files? (or know how to make)

lets say i want to make a mask with 8 characters 2 ?l 4 ?d 2 ?u


?l?l?d?d?d?d?u?u
?u?l?l?d?d?d?d?u
?u?u?l?l?d?d?d?d
?d?u?u?l?l?d?d?d
etc..
u get the point..
writing  every singel combination manual take alot of time!