How would you go about modeling this?

I am practicing and trying to teach myself Rhino. I am started to get familiar with most tools but i am still having a hard time coming up with a “Plan of attack” when i make things. This here for example. I started drawing lines in front view and do a few sweeps that i could boolean, but i quickly abandoned that plan. I dont know what to do next, perhaps i do one tooth that i copy around and rotate? I have no idea. People with more experience, how would you do?

No image, no file, no help