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select concat('Cost range is ', min(cost), '-', max(cost)) from mail_c
+ost mc join mail_areas ma on mc.zone = ma.zone where ma.area between 
+1 and 10 and mc.weight = 12;

zip      area
001    2
...
005    3
012    6
[...]

weight     area    cost
1              2          3.17
...
1              3          4.02
2              3          4.15
[...]

$areas = (
...
     '003' => 2,
     [...]
);