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.
Which of the following is a possible sequence of combinations for the student in the two successive weeks?
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