Goal and options: Secure a bicycle to metal railing.
output answer: Using a cable bike lock, loop cable around vertical post in railing. Take one end through the front wheel. Thread the other end through the back wheel. Lock the cable in between the two metal tubes in the middle of the bike frame.

Goal and options: Knife
output answer: Can be used to rip a Net

Goal and options: How to Make a Hardcover Book Christmas Tree
output answer:
To make a Hardcover Book Christmas Tree, first open up the book and draw a zig-zag shape on the pages. Trim off the paper around the design with scissors or an X-Acto knife, then you will have your christmas tree shape. Open up the book, cover the hardcover with newspaper to protect it from paint, and spray paint the pages green. Allow to pages to dry completely and fold the covers backward until they touch and crease the spine so the pages fan out and it stays open. Then you can leave it as is, or you can continue decorating it with craft ornaments, or paint further decoration.