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I'm not sure about the main four but the main six are machinery and equipment, computers, chemicals, pharmaceuticals, live animals, and animal products.
Asia
There are six different types of computers in the world such as the microprocessor. Another type of computer is the personal computers
Japan
It 's Kyushu
It is the Kyushu island
japan
What country?
Based on the size and use, computers can be categorized into seven types. They are embedded computers, super computers, main frame computers, servers, game consoles, mobile computers and personal computers.
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I Don't KNOW ask ben g
Companies in Country A can produce computers at a lower cost.