Explain how build shows that the $4013$ dual d$-$type flip$-$flop with positve edge trigger woRks using the circuit provide X$1$ X$2$ and X$3$ are leds S$2$ is a toggle switch and s$1$ is a button

How it goes is u press the button then x$1$ lights up then toggle the switch then press the button and x$1$ turns of and x$2$ lights up repeat process for x$3$ then i switch the toggle and i turn all the lights on then then switch the toggle again and press button the x$1$ turns off x$2$ x$3$ stay a light repeat till all leds are turned off how would i explain how this works