Compare three columns within one table. Help!

Hi All
I had a post up about this yesterday but I didnt have much luck and im still really stuck on this so if there is anyone who has any idea please help me.
I have three columns A,B,C within the one table. Column A may contain a value that is in Column B so if this is the case I need to enusre that it is not brought back in the query. I have tried using a minus function but it is not working very well. Probably because i am doing it wrong.
So basically I need the query to
Compare
(A) Column A with Column B - If a value is present in column B I want to minus it/remove it from Column B
(B) Column A with Column C - If a value is present in column C I want to minus it/remove it from Column B
(C) Column B with Column C - If a value is present in column C I want to minus it/remove it from Column B
OUTPUT AT PRESENT
COL A COLB COLC
12345 45666 78888
45666 78888 66666
66662 12345 37891
Desired Output
COL A COLB COLC
-------- 45666 78888
-------- -------- 66666
66662 12345 37891
Any help with this would be really appreciated
Thanks

SQL> select * from poles;
        P1         P2         P3
       123        101        123
       456        123        456
       789        456        999
SQL> select decode((select count(*)
2                from poles
3                where p2 = p.p1
4                or p3 = p.p1),0,p1) p1,
5          decode((select count(*)
6                from poles
7                where p3 = p.p2),0,p2) p2,p3
8 from poles p;
        P1         P2         P3
                  101        123
                             456
       789                   999

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