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+**Field**|**Type**|**Null**|**Key**|**Default**|**Notes**
+-----|-----|-----|-----|-----|-----
+merc\_subtype\_id|int(10) unsigned|NO|PRI| |auto\_increment
+class\_id|int(10) unsigned|NO| | | 
+tier\_id|tinyint(3) unsigned|NO| | | 
+confidence\_id|tinyint(3) unsigned|NO| | | 
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