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Dr. Md Rushad Rahman
এমবিবিএস(আরপিএমসি)
,
পিজিটি(মেডিসিন)
It's the same knot you tie before making the loop on your shoelace. First, label one end of the string A and the other B. Tie that knot (note whether A went in front of or behind B), and then tie it again, this time reversing A and B.
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