Can you solve this riddle?

English as a Second Language What do you want to talk about?
1

So, can anyone solve this riddle? (We know that vowel equals zero and consontant equals one, but the opposite value is the next letter.) Good luck :wink:

2

There is something I am missing in this riddle. Or I am thinking too hard. I don’t like it :smile:

3

This may help a little: Logic gate - Wikipedia

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4

The solution to this riddle is the word ‘stigma’.