var arr=[{flag:2001,
 num:3},
{flag:2001,
num:3},
{flag:2002,
num:4},
{flag:2002,
num:4}];

var arr2=[];
	for (var i=0;i<arr.length;i++) {
		if(ar(arr[i].flag,arr2))
		{
			arr2.push(arr[i]);
		}
	};

	
 for (var i=0;i<arr2.length;i++) {
 	alert(arr2[i].flag+'/'+arr2[i].num);
 }

function ar(flag,arr)
{
	for(var i=0;i<arr.length;i++)
	{
		if(flag==arr[i].flag){
			return true;
		}
	}
	return false;
}

 

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