Binary Numbers / dichotomous sorting Set

This is a set of cards, sorting lid, and keys to teach binary numbers from 0 to 31 OR to use to teach the concept of sorting via dichotomous key with T/F, Y/N questions.

The long square keys are for True or 1 bits, the long cylindrical keys are for False or 0 bits.

Print 5 each of the T and F keys, one sorting lid, and 32 blank cards, then use diagonal cutters to cut either the square "True" or "1" or "Yes" notches, or the "False" or "0" or "No" notches, out of the upper edge of the cards. An example "10100" or "decimal 20" card is included as an example. (you could design and print 32 different kinds of cards, but really, it's easier to just print them all blank and cut them.)

Obviously this is a very simple example of something with a very long history: Jacquard looms, Hollerith cards, the McBee keysort system, etc. This is a simple intro to the concept.

With a change in scaling this could also accomodate standard index cards, punched with a one-hole punch.

EDIT: final