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var txt=["DVD stands for 'Digital Versatile Disc'. A DVD is a type of optical media used for storing digital data.","An external hard drive is a storage device located outside of a computer that is connected through a USB cable or wireless connection. An external hard drive is usually used to store media that a user needs to be portable, for backups.","A small memory device that can be used to store data from a computer and to move it from one computer to another.","A hard drive is part of a unit (often called a disk drive, hard drive, hard drive or hard disk drive) that stores and provides relatively quick access to large amounts of data on an electromagnetically charged surface or set of surfaces. Today's computers typically come with a hard disk that contains several billion bytes (gigabytes) of storage.","It is a device consisting of a pair of earphones joined by a band placed over the head, for listening to audio signals such as music or speech.","A joystick is an input device consisting of a stick that pivots on a base and reports its angle or direction to the device it is controlling.","A device that connects one computer system to another using a telephone line so that data can be sent.","A small device that is moved by hand across a surface to control the movement of the cursor on a computer screen.","A printer is a machine for printing text or pictures, especially one linked to a computer.","A device which copies pictures and documents so that they can be stored on a computer.","A video camera connected to a computer, allowing its images to be seen by Internet users.","A wireless keyboard is a computer keyboard that allows the user to communicate with computers, tablets, or laptops with the help of radio frequency."];
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