In a survey of X university students, 64 had taken Discrete mathematics course, 94 had taken Object Oriented Programming course, 58 had taken Digital Logic  course, 28 had taken Discrete Mathematics and Digital Logic , 26 had taken Discrete Mathematics and Object Oriented Programming, 22 had taken Object Oriented Programming and Digital Logic  course, and 14 had taken all the three courses. Find how many had taken one course only.

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