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In order to discover all the functions of the human brain, scientists have been doing research for years. |
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The human brain hasn't been entirely explored yet although scientists have been doing research for years. |
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Despite years of research, scientists have not yet fully explored the human brain. |
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In spite of the research that has been carried out over the yearn, the human brain still contains some unexplored areas. |
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For years, scientists have been carrying out research on the human brain, yet they still haven't discovered all its functions. |