At a conference Exactly seven speakers Samia. Tariq, Umana. quamrul. Ramisa.vikash, and wasiq are to speak. In the schedule for the conference.there are seven slots available for speakers, and the time slots are numbered consecutively 1 through Exactly one speaker must be assigned to each time slot according to the following  condition: *Quamrul must speak immediately before or immediately after Tang speaks. *Tariq must speak sometime before Ramisa speaks. *Samia must speak in either time slot 1 or time slot *Vikash must speak in lime slot Inclusion of which conditions will result in only one legal  arrangement?