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| Class Summary | |
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| Expression | Logical expression, composed of statements and subexpressions that may be evaluated. |
| LogicalElement | Subclasses are part of a logical expression. |
| Operator | Stands for a logical operator (NOT, AND, OR). |
| Statement | A statement may be evaluated as being 'true' or 'false' but it may also be some string of which its presence may be tested. |
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