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pigeonÓ¦¸ÃÓµÓÐfly()
hawkÓ¦¸ÃÓµÓÐfly() hunt()

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class tiger : public animal
{
    can_run m_run;
    can_hunt m_hunt;
};
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tiger t1;
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rabbit : animal, can_run
tiger : animal, can_run, can_hunt
pigeon : animal, can_fly
hawk : animal, can_fly, can_hunt
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