A social Psychologist was interested in the custom of handshaking. He noticed that some people are more inclined than other to shake hands when they are introduced. One evening when he and his wife had joined four other couples at a party, he took advantage of the occasion to collect data. He asked each other the other nine people at the party how many people they had shaken hands with during the introductions. He received a different answer, from zero to eight, from each of the nine people. You can assume that Husbands and wives don't shake hands with each other and of course, people don't shake hands with themselves.
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