I remember years ago hearing that a tiny number of repeated perfect shuffles -- riffles -- can restore a playing card deck to its original order? How many? It takes seven shuffles; this is a pretty easy thing to do in Mathematica:

NestList[Riffle[Take[#, 26], Drop[#, 26]] &, Range[52], 8]

Next, I attempted to show graphically each of the intermediate shuffled decks -- far better eye candy than showing a list of 52 numbers. Fortunately Wolfram provides a means of displaying a graphic of a deck with a Resource Function:

ResourceFunction["PlayingCardGraphic"][Riffle[Take[Range[52], 26], Drop[Range[52], 26]], 
 CardSpreadAngle -> 0, ImageSize -> 1000]

One thing I learned during this exploration was how to apply an option of a Graphic to a ResorceFunction that doesn't provide that option. The "ImageSize->1000" is passed straight to the Graphic constructor. Without that option, the 52 cards get crammed together into an unreadable scrawl. :(. I then tried to apply the card-display function repeatedly with a NestList:

NestList[ResourceFunction["PlayingCardGraphic"][Riffle[Take[#, 26], Drop[#, 26]], CardSpreadAngle -> 0, ImageSize -> 1000] &, Range[52], 1]

This doesn't work. I want to pass the numeric list through the iterations of NestList, but I want to display the Graphic on each iteration. This strikes me as something that should be easy, but I'm missing a bit of understanding to do it. I've attached my Notebook to the end of this message. Please assist. Thanks.

I'm seeing a wonky behavior in the framework. If I go back to Quiz 4 in the framework, my score is there. However, the correct answers are erased. Reloading the webpage doesn't change this. Closing all webpages and flushing every wolfram-cookie in my browser doesn't change this. Rebooting my computer (M1 iMac) doesn't change this.

I'm running Sarari on the iMac. If I open to Quiz 4 in Chrome, the answers are filled in. If I open with DuckDuckGo, the answers are filled in. If I run Safari on a different computer (M1 MacBook Pro), I'm able to see my answers to Quiz 4 filled in. Strange! Is the framework doing anything different for Quiz 4?

It appears to me that the first question in Quiz 5 scores incorrectly.

Phil, I agree that Quiz 1, Question 5 is a problem. All of the answers are built-in symbols, not unassigned variables. One way to check this hypothesis is to try to assign them values:

Black = 1

If Black is an unassigned variable, then the assignment will work, otherwise you'll get an error message that says "Symbol Black is Protected".

Probably one of the answers is supposed to be lowercase.

Hi there! Ah, I agree on Quiz 1, Question 5. It's much more misleading than we intended. The question is actually referring to what color the notebook shows an undefined variable (ie with syntax highlighting). I'll get that question edited for clarity.

Thanks for the feedback! I'll have a look at Quiz 2 question 4.