Hey guys,
When introducing Disjoint Sets in the Cater Waiter Learning Exercise, the example says birds.isdisjoint(mammals) before birds and mammals are defined. Same goes for additional_animals . These variables are defined later on, in the Subsets and Supersets section.
Nothing too serious but could be fixed easily.
I was unsure about the process for those kind of issues, but very happy to open the PR to fix it if it can help.
Cheers
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