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select m, p from various_joined_tables_and_views where u = N group by 
+m, p, u
</code.
...
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alot more

[[m1, [p1,p2,p3], [m2, [p1,p2]], [m1, [p1]]]

my @data;
my %mkts;
...
    $data[$n][1] = [$p] + 0;
  }
}