gistfile1.txt

- (BOOL)isEqual:(id)object;
{
    if ( object == self ) {
        return YES;
    }
    
    if ( object == nil || ![object isKindOfClass:[self class]] ) {
        return NO;
    }
    
    BOOL xEqual = [self.coordinates[1] isEqualToNumber:[object.coordinates[1]];
    BOOL yEqual = [self.coordinates[0] isEqualToNumber:[object.coordinates[0]];

    return ( xEqual && yEqual );
}