Can someone help with this sentence involving double denial? 無いこともないのですが > Can someone explain ? It's a double denial from what I can tell. So does it become this: > Actually it's not like there's no method at all, however I cannot possibly think that it will be useful to you

Yup!

The double negatives cancel to make it affirmative. It does show the writers hesitation in telling the listener about them or to use the method at all.

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