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Welcome, eagle eyed readers!

Everyone makes mistakes, and everyone includes us. If you think you've spotted something in the books which we should know about, because it is wrong, or just slightly off, then let us know. Your suggestions are welcome. If there are any errors, we will upload them here.

We're pretty good about giving out prizes to people, and usually it's a $10 UBS book voucher set aside for you.

Terms and conditions to receive prizes:

1. You must be the first person to identify the error
2. The error cannot be a grammatical or spelling error
3. We must deem the omission significant
4. If the error is in the older versions, then... maybe check that it hasn't been changed in the new versions before contacting us - we do update the books every year!

Get on to the contact page if you are an authenticated user, or email us directly at aptitute@gmail.com.