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    There are already many arithmetic expression search katas. What makes this kata special from those ones?

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    Messages from tests are not really helpful:

    • ValueError: list.remove(x): x not in list, or
    • ValueError: not enough values to unpack (expected 3, got 1), or
    • TypeError: cannot unpack non-iterable int object,
    • ... etc

    It would help if tests did some preliminary checks and explained what is an actual problem rather than crashin.