public override string ToString()
{
var res = new StringBuilder();
res.AppendLine("WorkingGrid:" + Environment.NewLine + AnswerGrid.ToReadableString());
res.AppendLine();
res.AppendLine("RowClassifiers:" + Environment.NewLine + Rows.Count);
res.AppendLine("ColumnClassifiers:" + Environment.NewLine + Columns.Count);
return(res.ToString());
}