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  1. 1. IOS-Internetwork operating system GPRS-Global packet radio service MP4-MPEG layer-4 audio MPEG-Moving pictures experts group JPEG-Joint photograpic experts group LED-Light Emmiting Diode MAC-Media access control PDF-Portable document format SD-Standard definition DHTML-Dynamic hyper text markup language SMS-Short message service MMS-Multimedia messaging service IOS-Internet operating system