public PreviewCrosswordWord(DictionaryWord dictionaryWord, CrosswordWordPosition position)
     : base(null, dictionaryWord, position)
 {
 }
 public PreviewCrosswordWord(string word, CrosswordWordPosition position)
     : base(null, new DictionaryWord(word), position)
 {
 }
 public CrosswordLetter(string letter, CrosswordWordPosition position)
 {
     this.letter = letter;
     this.position = position;
 }