There are 20 seniors serving the student council of the Bacnotan National High School this year. Of these, 3 have not served before, 10 served in the council in their Junior years, 9 in their Sophomore years, and 11 in their Freshman years. There are 5 who served during both their Sophomore and Junior years, 6 during both their Freshman and Junior years, and 4 during both their Freshman and Sophomore years. How many Seniors served in the student council during each of the four years in high school?

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