worldlist extra rules

[Chinchilla]

how to treat a wordlist file as follows,and that such work keys -a6 -a7 ?

dicfile.txt
aa
bb
cc


aaaa
aabb
aacc
bbaa
bbbb
bbcc
ccaa
ccbb
cccc

and how combine -a6 -a7 ?

What exactly are you asking here? How to run a Hybrid attack?

'-a 6' and '-a 7' are two separate attack types, they cannot be combined.

This will help: http://hashcat.net/wiki/doku.php?id=hybrid_attack