sentences:  In addition to individual and club call-signs, the WPC allots temporary call-signs for contests and special events.For example, in November 2007, the WPC temporarily allotted the prefixes "AT" and "AU" to selected ham operators to mark the anniversary of the birth of radio scientist Jagadish Chandra Bose.The Indian Union territory (UT) of Andaman and Nicobar Islands are assigned the prefix VU4 and the UT of Lakshadweep is assigned VU7.