User talk:Thien19841

Welcome
 Hi Thien19841, and Welcome to Wikipedia!  Welcome to Wikipedia! I hope you enjoy the encyclopedia and want to stay. As a first step, you may wish to read the Introduction.

If you have any questions, feel free to ask me at my talk page — I'm happy to help. Or, you can ask your question at the New contributors' help page.

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Chemistrygeek Good luck, and have fun.