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| abstract type Person end | |
| abstract type Tourist <:Person end | |
| abstract type Deer end | |
| encounter(a::Deer, b::Tourist) = "bows politely" | |
| encounter(a::Tourist, b::Deer) = "feeds" | |
| encounter(a::Person, b::Deer) = "beckons" | |
| encounter(a::Deer, b::Person) = "ignores" | |
| encounter(a::Tourist, b::Deer, foo::String) = "feeds deer $foo" |
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