code: function(){
  		var cell = this.getcell();
  		if(cell.isnull || cell===this.mouseCell){ return;}
  
  		this.mouseCell = cell;
  
  		var clist = new this.klass.CellList([cell]);
  		if(this.puzzle.playmode){ clist.ansclear();}
  		else                    { clist.allclear();}
  
  		cell.draw();
  	}
docs: --------------------------------------------------------------------------- mv.inputclean_cell() Cellのqans(回答データ)を消去する ---------------------------------------------------------------------------