A student has taken 5 courses : Philosophy, Biology, Economics, Mathematics and Literature. He studies for these courses according to the following pattern : Every week the student studies for exactly three courses. If he studies Biology in a week, then he also studies Philosophy that week. If he studies Economics in a particular week, then he does not study it in the following week. In any particular week he studies not more than one of the subjects studied in the preceding week.
If the student studies Philosophy, Biology and Economics in the first week, which of the following combinations must be studied in the third week?
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