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    interface Aircraft {
        method set_pitch (...);
    ...
    class Jet : isa Aircraft {
        method set_pitch (...) {...}
    }
    
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    class Jet {
        method set_pitch (...) {...}
    ...
    interface FlyingThings {
        require method set_pitch (...);
    }
    
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    class Piano {
        method set_pitch (...) {...}
    }
    
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        ThickInterface    ThinInterface
                \        /
                ThickThin
    
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    unshift @ThickInterface::ISA, 'ThinInterface';