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Amazon.com : KTRIO Pack of 6 Colors Handheld Tally Counter 4-Digit Number Count Clicker Counter, Hand Mechanical Counters Clickers Pitch Counter for Coaching, Knitting, People, Lap, Fishing, Golf, Toddler & Fidget :
How to design a synchronous counter 4 bit using JK flip flop that can count up even numbers from 0 to 14, and count down odd numbers from 15 to 0 in 1 system - Quora
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