For Words Containing Letters add Excluding Letters

Add the option Excluding The Letters (or Without) for words Containing The Letters

Often when I look for words containing certain letters I also know other letters which I can't use. For example most of words containing "KGG" have an "N". But I don't have an "N". Only thing I can do is checking every word for absence of an "N". Lucky me it is only 4 pages! Usually there are more than one letter to exclude. And in many cases there are 25 pages of search hits.

Thanks a lot!
All the best!