1

With the double-sided mermaid and stars paper showing mermaid side-up, trim the paper in half from top to bottom to create two 6x12" pieces with the mermaids the right way up.

2

Take one piece, rotate the paper then score and crease at the 6" half way point to create the card blank. Repeat with the other piece. Layer one half of one panel onto one half of the other so you have a card blank with three equal panels.<