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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.
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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.