I found these two grammatical forms, ないことはない and ないこともない. To me they seem really similar both in usage and meaning, am I missing something? If somebody could give me some examples too, it would be really helpful.
Edit
I might be wrong but in the そうまとめN2, ないことはない and ないこともない are listed as two different forms and with two different meanings, as in: 1)やめられないこともない。 it is possible to quit 2)覚えられないこともない。 it is not impossible to remember
