Room 2004, 20/F, 655 Nathan Road,
Mongkok, Kowloon, Hong Kong
Copyright © 2019 by Alpha Stem Education Limited.
All rights reserved. No part of this publication may be reproduced, distributed, or transmitted in any form or by any means, including photocopying, recording, or other electronic or mechanical methods, without the prior written permission of the publisher, except in the case of brief quotations embodied in critical reviews and certain other non-commercial uses permitted by copyright law.