public void addFileVariablesAppearances(List<VariableAppearance> fileVariablesAppearances) {
		fileVariablesAppearances = setFileToAppearanceList(fileVariablesAppearances);
		for (VariableAppearance variableAppearance : fileVariablesAppearances) {
			if (!this.fileVariablesAppearances.contains(variableAppearance)){
				this.fileVariablesAppearances.add(variableAppearance);
			}
		}
		Collections.sort(this.fileVariablesAppearances);
	}