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Ah i see. Btw for the first pic I meant that the relationship was ternary with only "enrols" as a composite entity but for some reason they added "offerings". i know M-M needs to be convert to two 1-Ms but why couldn't they do with it with just "enrols"?

thanks! can you tell me what is meant by the green circle in the 3rd pic?

I had a few questions about this and wondering if anyone who knows can help! http://i.imgur.com/HEjpRZ9.png In the picture before the above we were asked make a Courses-<enrols>-Programs and enrols points down to Student (ternary relationship) but in this example we had to make it a...