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DEPARTMENT OF SCIENCE AND TECHNOLOGY Copyright © 2016 Department of Science and Technology, Philippines All rights reserved No part of this book may be reproduced in any form or by any electronic or mechanical means i
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Document Date: 2018-01-22 03:51:54
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DEPARTMENT OF SCIENCE AND TECHNOLOGY Copyright © 2016 Department of Science and Technology, Philippines All rights reserved No part of this book may be reproduced in any form or by any electronic or mechanical means i