Write program to generate a click train

I would like to write a MATLAB program which will generate 12 periodic sequences of "click" sounds that will be audible and can be heard on the speakers. Each of these sequences should have a different ICI (look at image I attached to see what I mean by ICI). the ICI's should be 5, 10, 15, etc...

We should use a T = 0.1ms, duration of each sequence=1sec, and sampling rate = 20kHz.

I know that I should use the functions sound or soundsc, but I am really not sure where to go with this.