How do I use Petstages Occupi Activity Bits?

 
How do I use Petstages Occupi Activity Bits?
I bought my dog the Petstages Occupi toy with the bars that fit inside. I now see online that the offer Activity bits. Do I push them in the little holes on the side or throw them in the large hole at the bottom. And how interested in them is your dog? My dog likes the bars and it keeps him interested for about 30 minutes.
Either way is fine, but it would be easier to put them in all at once. This is a very good toy to keep them occupied. However, it should not replace adequate exercise.

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