You forgot to tell us the most important information: how did you get twenty badly-named** variables into the workspace? Did you write them all out by hand? Did you LOAD them? The point at which you created those twenty vairables in the workspace is the best place to fix the bad data design, by e.g. LOADing into an output variable or indexing into one array withing a loop. But it all depends on how those arrays are created, which you have not told us.
**because forcing meta-data into variable names invariably leads users into writing slow, complex, inefficient code:
