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//Example 8.17
clc
disp("The IC 74191 is a 4-bit binary counter, therefore f_out = f_CLK / 16 in up and down counter mode. If f_CLK = 500 Hz and f_out = 50 Hz we need mod 10 (500/50) counter. The fig. 8.39 shows the mod-10 counter using IC 74191")