Exercise for finding tests for boundary conditions.

A tax table is a table that outlines the tax rates applicable to different income levels. It has income ranges and corresponding tax rates for each range.

Tax progression refers to the way in which tax rates change as income increases. Higher-income individuals pay a higher percentage of their income compared to lower-income individuals.

1. Try to find test cases and implement good tests.
2. When all test cases are done, check the code coverage to verify that all production code is tested.
3. Some languages provide frameworks for Mutation testing. Use these to verify the quality of your tests.

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