Last week @cheesemonkeysf wrote a great post about turning words into math. She invented the Phrase Translator sleeve with a sliding insert. Here's her picture.
I love this idea! I tried it using card stock and it was more difficult than I had anticipated. I'm left-handed and therefore a terrible cutter. I used card stock and it was too stiff- difficult to fold. I also felt like it was to skinny for me.
I tried making my own (because I just can't leave anything alone) and it took a while but I'm pretty happy with it.
Here's a picture of the two side-by-side.
Basically, mine requires less cutting because that's just something I need in my life.
Here is the sleeve (doc/pdf) and the insert (doc/pdf).