Dependency and Lookup

More question here ^^
I thought I should use lookup on this but Im not quite sure.
How do i go about this one?

On my Cell A1, I may have (RX, RWX, RWXD or 0)
On my Cell A2, What i want is to have a return with following.

RX = Read and List
RWX = Read, Write and Execute
RWXD = Full
0 = Unknown
Blank = Unknown

Thanks in advance.

Andrew, try this in A2:

=LOOKUP(A1,{0,"RWX","RWXD","RX"},{"Unknown","Read, Write and Execute","Full","Read and List"})