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use strict;
my %table;
...
ob8, ob1, 12
ob9, ob1, 90
ob3, ob2, 87

        ob1     ob2     ob3     ob4     ob5     ob6     ob7     ob8   
+  ob9
ob1     -       34      56      12      78      23      23      12    
+  90
...
ob8     12      -       -       -       -       -       -       -     
+  -

ob9     90      -       -       -       -       -       -       -     
+  -