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1. A datatype that can only have two possible values: true or false.
2. An operator that takes Boolean values as inputs and produces a Boolean value as output.
3. The branch of philosophy and mathematics that deals with formal systems of reasoning.
4. A Boolean value that represents the concept of negation.
5. A table that shows the outputs of a Boolean function for all possible combinations of inputs.
6. A Boolean operator that returns true if at least one of its operands is true.
7. A mathematical structure that models logical expressions and operations.
8. A Boolean operator that reverses the logical value of its operand.
9. A Boolean operator that returns true only if both of its operands are true.