Function group logical

Logical function Function group has those functions and groups:

• Function and - Return true if all the arguments are true, nothing if there is a non boolean argument and false if there is a false argument.
• Function or - Return true if any of the arguments are true, nothing if there is a non boolean argument and false if all the arguments are false.
• Function xor - Return true if one, and only one, of the argument is true.
• Function not - Return false if the argument is true and true if the argument is false.

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