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Що виконує фрагмент програми struct SEO * rob=first;while (rob->number!=150 && rob->next!=NULL) rob=rob->next;if(rob!=NULL) { current=new(SEO);current->number=100;gets(current->name);current ->next=rob->next;current->prev=rob;rob->next->prev=current;rob->next=current;}else puts(“такого елемента намає”);