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Latest news 2019-11-04: The giveaway of two signed copies of “Quack, quack, quack. Give my hat back!” has closed and the winning entrants have been selected. Thank you to everyone who took part.

B.7 Command ... already defined

You have tried to define a command which already exists. Try giving it a different name. Remember never to redefine a command if you don't know what the command originally does.

Alternatively, you have tried to define an environment which already exists. Give the new environment a different name. Again, never redefine an environment where you don't know what the original environment does.


This book is also available as A4 PDF or 12.8cm x 9.6cm PDF or paperback (ISBN 978-1-909440-00-5).

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