#Declare network_nodes as a set
network_nodes=set()
#The list has duplicate entried for NODE1
list = ['NODE_1', 'node_2', 'node_3', 'node_4','NODE_1' ]

for x in list:
	network_nodes.add(x)

print("The original list : \r", list)

print("The set : \r", network_nodes)