Original: eighteen

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Solutions:

Happy / Birthday / Boy / Girl / Grand / Son / Daughter / Niece / Nephew / Best / Mate / Sweet /Sixteen / Dance / Party / Enjoy / Yourself / OMG / YOLO / You / Look / Amazing / Are / Gorgeous / Stay / Out / Of / Trouble / Hello / To / Boys / Girls / Parties / Eat / Cake / Love / You / Hug