2-to-10 counter circuit and its signal waveform

Shown is a circuit in which binary numbers are represented by decimal numbers. It is composed of four JK flip-flops and three AND gates. Input
10 clock pulses t and output 1 carry pulse . This circuit is the most widely used. Digital circuits are circuits that process binary digital signals, but
people are accustomed to using decimal calculation methods, so using this kind of circuit can provide convenience for people's counting and calculation.