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Dr. Md Rushad Rahman
এমবিবিএস(আরপিএমসি)
,
পিজিটি(মেডিসিন)
Its a ball that is made of white stuff called Styrofoam. If you don't know what it is, go to to your nearest craft store, like Michael's, and ask for a Styrofoam ball. They might ask you for the size - just say medium or large.
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