9. Mrs. Ali wishes to decorate her house. She hires the services of a plumber, a carpenter, a painter, an electrician, and an interior decorator. The decoration is to completed in a period of 5 days Monday to Friday. Every worker will be taking one complete day to do his job. Mrs. Ali will allow just one person to work per day. The painter can do his work only after the plumber and the carpenter have completed their jobs. The interior decorator has to complete his job before that of the electrician. The carpenter cannot work on Monday or Tuesday.
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