Acknowledgements

This course was written by Hilary Holmes and Maria Townsend.

Except for third party materials and otherwise stated (see FAQs), this content is made available under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 Licence.

Unit image: courtesy of Stuart Miles at FreeDigitalPhotos.net

Every effort has been made to contact copyright owners. If any have been inadvertently overlooked, the publishers will be pleased to make the necessary arrangements at the first opportunity.

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