Ouf! Thanks to all for the numerous answers to my question

Ok, I was tricky:

!( this && that) = !this || !that

could have been a turn around of unallowed mixed && and || if
parenthesis were available :

[this && that || another] not allowed
[this && !( !that && !another)] allowed

Stupid idea anyway:

If parentheses were allowed, a syntax parser and _expression_ solver is
needed
[this && (that || another)], [(this && that) || another]
would be solved in two punctual different stages
so mixing && and || would not matter

It would probably solve single and double arguments operators too
So resolving [this && that || another] would just be a matter of
precedence and the ! operator would probably be available






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