Set like feature

[Hari Pulapaka]

Hi,

I have a list of space delimited strings ending in a newline.
Eg: a = ['a sfds sdf s df 34 ew\n', 'df sdf s f s ssf\n']

Now inside each row, I have a space delimited list of fields.

Now I want to compare the fields in each row of the array and see which
fields do not match.

Think of it as a 2 dimensional array of size mn, and comparing each
each element on a column by column basis.

I am using python2.2 so no sets. Can anyone think of an efficient way
to do this? 

Thanks,

Hari