text: //
  //  PracticeCardSelector.h
  //  xFlash
  //
  //  Created by Mark Makdad on 12/27/11.
  //  Copyright (c) 2011 Long Weekend LLC. All rights reserved.
  //
  
  #import "Tag.h"
  
  @interface PracticeCardSelector : NSObject
  - (NSInteger)calculateNextCardLevelForTag:(Tag *)tag error:(NSError **)error;
  - (CGFloat)calculateProbabilityOfUnseenWithCardsSeen:(NSUInteger)cardsSeenTotal totalCards:(NSUInteger)totalCardsInSet numerator:(NSUInteger)numeratorTotal levelOneCards:(NSUInteger)levelOneTotal;
  @end
  