For example, when searching on 'fashion':
None will only match 'fashion'.
+2 (average) will match 'fashion', 'fashon', etc. (this is good for catching spelling mistakes).
+7 will match 'fashion', 'fshn', 'passion', and lots more...
When searching on an exact phrase, using double quotes, you can allow a variation in the order and number of the words. For example, searching on 'come here':
None will only match 'come here'.
Allow ... 1 would match 'come here', 'here come' and 'come to here'.
Allow ... 3 would also match 'come to me here'.
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