The problem lacks clarity on whether parentheses are valid alongside arithmetic operators and square brackets in the Insurance Calculator. Adding a new example or rewriting an existing one to include parentheses would explicitly address this and enhance understanding for all users.

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The problem doesn't make clear that parentheses are valid input alongside the usual arithmetic operators and square brackets. I feel that a new example should be included, or an existing example rewritten, to include parentheses to make this more explicit.

EVIL problem definition : it should say that an assignment is ALLOWED to create new variables :)

this looks like it’s heading towards being the next COBOL!