Anchor: Public courses are very popular, so book in advance.
Entailed: Public courses fill up fast so be sure to book in advance.
Contradiction: Public courses aren't popular so it's easy to sign up for one.
Contradiction: What he asked me to do ended up being not only boring, but also sad.
Contradiction: A man wearing a jacket is digging a hole.
Contradiction: A guy is reading a book in an attic.
Contradiction: A woman is selling lemonade.