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class Node {
	constructor ( value ){
		this.value = value;
	}
}

class SingleLinkedList {
	
	constructor(){
		this.root = null;
	}

	add ( node ) {
		
		if( this.root == null ){
			this.root = node;
			return;
		}

		var current = this.root;

		while ( current.next != null ){
			current = current.next;
		}

		current.next = node ;
	}

	print (){
		
		var current = this.root;
		
		while (current != null){
			
			console.log( current.value);
			current = current.next;

		}
	}
}

var nodeObj1 = new Node ( 22 );
var nodeObj2 = new Node ( 25 );
var nodeObj3 = new Node ( 21 );
var nodeObj4 = new Node ( 20 );

var sll = new SingleLinkedList();


sll.add ( nodeObj1 )
sll.add ( nodeObj2 )
sll.add ( nodeObj3 )
sll.add ( nodeObj4 )


sll.print();