writing for an advisor a thisisstatement

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Hi I am already graduated with Masters degree and I want to complete my thisis in according to be able to reach my PhD. I already have a subject of my research, but still I am very confused how to sent the first email to a potentioal advisor. The main subject that I am interested in is: "which affects the marital happiness and satisfaction from the marriage life> matching expectations Vs. matching fantasies...
I would like to have some help on writing a brief and thisistatement for a potintioal advisor...
Thanks

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