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#include<stdio.h>
#include<conio.h>
struct node
{
	int data;
	struct node*next;
	struct node*prev;
	
};
struct node*head=null
struct node*last=null
struct node*current=null
void print list(){
	struct node*ptr=head;
	print("%d<=>",ptr data);
	ptr=ptr next;	
}