A student has taken 5 courses—Philosophy, Biology, Economics, Mathematics and Literature. She studies for these courses according to the following pattern : Every week the student studies for exactly three courses. If she studies Biology in a week, then she also studies Philosophy that week. If she studies Economics in a particular week, then she does not study it in the following week. In any particular week she 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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