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lua: typo
`LoudDog.__index` is `Dog`, not `LoudDog`.
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@ -321,7 +321,7 @@ seymour:makeSound() -- 'woof woof woof' -- 4.
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-- Dog.new(LoudDog) as LoudDog has no 'new' key,
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-- but does have __index = Dog on its metatable.
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-- Result: seymour's metatable is LoudDog, and
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-- LoudDog.__index = LoudDog. So seymour.key will
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-- LoudDog.__index = Dog. So seymour.key will
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-- = seymour.key, LoudDog.key, Dog.key, whichever
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-- table is the first with the given key.
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-- 4. The 'makeSound' key is found in LoudDog; this
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