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Message: [QUOTE="grishin-mailing-lists, post: 4066898"] Do you know De Morgan's laws? They are very helpful in cases like this: Yep. They appeared in a discrete math book I read last year. Unfortunately there were no connections to real-life problems and I didn't notice it's possible to use them in my day-to-day work. Now it's really time to reread the chapter and do some additional exercises. like that? char *exceptions[] = { "exception1", "exception2", "exception3" }; and treating them within a subroutine for (i = 0; **(exception + i); i++ ) { puts(*(exception + i)); } Is that correct? I'm not sure about the invariant. Thank you for your time in this matter. [/QUOTE]