To make our code more expressive, we can refactor the operations above by creating a multi-clause function that uses pattern matching to map all the behavioral possibilities of a double boolean negation. Rich Experience. Aluminium alloy sandblasted metal top case 4. Examples: In the following code, an if statement is used in conjunction with pattern matching. If the new version is disapproved, we can return to the original version by applying Rename an identifier to it.
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