The logic only uses NAND gates, but if you consider the flip flop outputs as A, B, and C, it is easier to think of the logic as (A&B)|(B&C)|(A&C). If you apply DeMorgan’s theorem you can convert ...
Texas Instruments’ 5400 and 7400 TTL quad 2-input NAND gate has been in continuous ... a few we could hook up an LED or make an astable flip-flop if we wanted to. But the interesting story ...