drag words in a rich text box

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VB

Hi!I'm currently trying to make a smart word processing tool.For that I need a code to do this,
There is a rich text box on the form and the user can enter a text.If he want to move the position of a word he select the word and drag it onto an another position in the rich text box and when he click on it the word placed into that position.
Please give me a code if it possible to do!
Thank you!