I've searched the web but I've found no solution to this problem.

What is the logical priority for operators NAND, NOR and XNOR?

I mean, considering as example the expression

A AND B NAND C

which operator should be evaluated first?
Obviously NAND can be translated as NOT-AND (as NOR is NOT-OR and XNOR is NOT-XOR), but 

(A AND B) NAND C != A AND (B NAND C) = A AND NOT(B AND C)

According to my researches there's no a defined priority for such an expression, so I think the simplest solution is to evaluate the operators according to the order they appear in the expression, but I may be wrong.

Any suggestions?

operators logic operator-precedence
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