4. Match the parts of the sentences. 1) A computer is an electronic machine 2) There are different types of computers 3) The computer system consists 4) The central idea of a computing system is 5) The most common current uses of computers are 6) Computers enable users to a) Make notes, arrange appointments and index details of business contracts. b) Which can be used to store, to process and display data. c) Of two main elements: the machine and programmes, or hardware and software. d) Personal, educational and commercial. e) A desktop, a laptop, a notebook, a subnotebook, a palmtop, embedded computers, etc. f) That input is processed into output.​