During the Seminar week in a college, two seminars on each of the seven topics A1, A2, A3, A4, A5, A6 and A7 are to be given by different professors among - B1, B2, B3, B4, B5, B6 and B7 The seminars are to be arranged in seven days from Monday through Sunday. Two seminars are to be given on two different topics, in two sessions (morning and after-noon) on each day such that the seminar, on each topic is to be given twice in that week. Each professor should give the seminar in two different sessions, for example if a professor gave the seminar on Monday in the morning session, he cannot give the seminar in the morning session in any of the remaining days. Each professor gives his both the seminars in the same topics. The seminar on A2 cannot be on Monday but both the seminars on A2 are to be finished before the last seminar on A5. B2 gives seminar on A4 and B5 is the first as well as the last professor to give the seminar. The arrangement was made such that on two of the days only B1 and B6 give the seminar and B completes the session before B6. Between the seminars on A2, four seminars are to be given and between the seminars on A1, six seminars are arranged to be given. The seminar on A3 is arranged to be given on Friday in morning session and the seminar on A7 is arranged to be given on Sunday in morning session. On any three consecutive days, any professor can give at most one seminar. B3's seminar must be arranged on Wednesday afternoon and B3's seminar must be arranged on Thursday morning.