how to generate pulse with different interval in Matlap/simulink?

Is it possible to generate pulse with different times in one cycle in Simulink. for example, for period is 20ms, I want to generate pulse form 0 to 5ms and 15ms to 20ms.

Could you please advise me how can I make it?

Thank you very much for your time.

Answer 1

[Yao Li]

The block named Signal builder