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The doctor wanted to marry  a woman doctor who had plenty of money and a good medical practise because his earnings were meager . He also wanted his wife to be fat because incase he made any silly mistake and run away , she wouldn't be able to catch him

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Doctor thought that her wife should be a fat women with a reasonable fact and she would have plenty of money and qualified doctor. if he made any mistake she should not catch the doctor so, he wants to marry a fat woman.