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what ; that that ; what that ; which which : that
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The engineer had worked out the idea for many years. The engineer had been working on the idea for many years. The engineer suggested the idea to the British government and industrial circles for many years. The British government and industrial circles accepted the idea many years later.
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to uncomplete uncompleted uncompleting. uncomplete
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to uncomplete uncompleted uncompleting. uncomplete
the second engineer had got into the engine room the second engineer got into the engine room has the second engineer got into the engine room did the second engineer get into the engine room
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what; that which; that that; which that; what
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