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Old 07-13-2009
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Ygor Ygor is offline Forum Staff  
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Try...
Code:
awk '{n=++a[$1];b[$1,n]=$2}END{for(c in a)for(n=1;n<=a[c];n++)for(z=1;z<=n;z++)print b[c,z],c,b[c,n]}' file1|sort -k 2,2 -k 1,1 -k 3,3

Result...
Code:
A aa A
A aa B
A aa C
B aa B
B aa C
C aa C
X bb X
X bb Y
X bb Z
Y bb Y
Y bb Z
Z bb Z
O cc O
O cc P
O cc Q
P cc P
P cc Q
Q cc Q