Okay, lame I know, but I just downloaded and printed all of these cards, and as a bonus I just happened to have a bunch of ‘o’ rings laying around waiting to be used! Love, Love, Love it!
I got them from here!
Edited: I apologize, looks like the blog owner of these removed them from her site. I do have some flashcards you can print:

I realize they’re bigger,  so maybe you can print them half size until I make some?

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