Two days after letting an opportunity slip through their grasp, the Barton Community College volleyball team took to task and stayed the course Wednesday night in a convincing sweep over Pratt Community College.   Paddling the Beavers 25-14 in the opening set, the Cougars made short work of the night with twin 25-20 victories to snap a five match losing streak at the Dennis Lesh Sports Arena.  The result improves Barton to 3-2 in conference play and 14-4 on the season while dropping Pratt to 1-3 in the West and 6-10 overall.  Next up for the Cougars will be a 2:00 p.m. first serve at the Barton Gym against conference favorite and No. 20 ranked Hutchinson Community College.