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Target coverage problem in wireless sensor networks remains a challenge. In target coverage problem, the fixed number of targets is continuously observed by a number of sensor nodes with the aim of maximizing the lifetime of the network. A sensor covers targets which are within the sensing range. For a set of sensors and a set of targets, the sensor-target coverage relationship is assumed to be known. A sensor cover is a set of sensors that covers all the targets. The target coverage problem is to verify a set of sensor covers with maximum aggregated lifetime while constraining the life of each sensor by its initial battery life and upper bound.