1 | initial version |

You may have introduces variable `sum`

with a rational value somewhere earlier in your code. If that the case, calling `sum()`

will raise an error like the one you observe.

2 | No.2 Revision |

You may have ~~introduces ~~introduced variable `sum`

with a rational value somewhere earlier in your code. If that the case, calling `sum()`

will raise an error like the one you observe.

3 | No.3 Revision |

You may have introduced variable `sum`

with a rational value somewhere earlier in your code. If that is the case, calling `sum()`

will raise an error like the one you observe.

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