± ± ± ± D ± | D t § § ± ± ± ± ± ± | D ° § § D | ° ± ± | t ± ± ± ± ± ± ± ± | ÷Õ Å ÷ D ± ± ± | ° ± ± | ± ± ± ± ± ± ± ± ± ± ± ± ÷Õ Õ ÷Õ Å ÷ Õ ÷Õ D D ± ± ± ± ± ± ± ± ± § § D ± § § ± ± ± ± ± ± ± ± % D | | | | § § " ± ± D ± ± | | § § " | | D | | § § 173