what does ptr->prev->next=new_node do
what does it point to exactly
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A
Walter
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Walter
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MᏫᎻᎯᎷᎷᎬᎠ
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MᏫᎻᎯᎷᎷᎬᎠ
MᏫᎻᎯᎷᎷᎬᎠ
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MᏫᎻᎯᎷᎷᎬᎠ
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