This paper deals with formal specification of the non-slotted CSMA/CA protocol in wireless sensor networks(WSN) whose some nodes own a greedy behavior. This protocol requires sensor nodes to wait some time before initiating a transmission. whereas greedy nodes may try to reduce their waiting duration. which may penalize other nodes. https://www.spidertattooz.com/The-GelBottle-Inc-Gel-Polish-Cashmere-67oz-p20053/