Suggestions to generate a pulse train in Simulink

Hi! Apologies if this is quite a simple thing. I want to generate a series of pulse trains to stimulate an animal's whiskers. I was able to do this using a script, but I want to do this using Simulink blocks. The pulse train should be something like this:

I can get a simple pulse working using the pulse generator block, but I don't know how to include "nested" pulses.

[Luis Cobar]

A bit silly, but I figured it out after tinkering some more. In case is useful for anyone else, I solved this using two logic gate blocks. Please check the following figure: