5.7 ������ ������

� � � � � � ��� �� � � � � � �

� � � � � � �������� ����� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � ������� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � ������

� �� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

� � � � � � � � ������ ����� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � ��������