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α γ γ α í ý γ γ τ τ τ √3 τ τ =

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� � � � � � ! " # $ % & ' # � � � ( ! ) � * � � ' % #+ , - . / 0 1 2α 3 4 5 6 7 γ 8 , 9 : ; <

γ 8 , / = 1 0 2> : ; <α ? @ A @ 5 ; B �; C 7 D 5 E F G C 7 D 5 E H = 7 I F 3 J , 7 3 J K 4 = > : ; < B 5 5 @ 9 ? L 6 M ; 5 4 N K 4 O K A5 E 5 @ 9 ? L 6 M ; 5 4 6 M K 46 P G 9 @ Q Q ; 4 M 5 ; O 9 G @ L < ;; C G @ A < ; O K A R @ 6 4 5 @ A 9 O ;G C S A 6 M 9 T ; 5 ; Q N K 4 O K A Q3 J , U P Q @ Q 6 9 A < ; V O 9 6 M 9 < 6 @ K A 5 ; Q N K 4 O K A Q3 4 U P Q @ Q 6 9 A < ; V O 9 6 M 9 < 6 @ K A 5 ; O 9 G @ L < ;9 Q Q ; ? N O P ;

U P Q @ Q 6 9 A < ; V O 9 6 M 9 < 6 @ K A 5 ; Q G @ L < ; Q> < @ ; M W 0 D 2 W 0 X 2 W D 2 23 J ; A Y G 9 D Z [ I D [ 2 = [\ O ] 9 0 ? K 5 ; Q 5 ; M 4 @ A ; G K Q Q @ N O ;•

U 4 G 6 4 M ; 5 4 N K 4 O K A• ^ K @ A _ K A A ; ? ; A 6 5 ; Q G O 9 ` 4 ; Q ; A < K A 6 9 < 69 : ; < O 9 6 a 6 ; 5 4 N K 4 O K A� � � � � � ! " # # ! � ' " � � ( ! ) b c ( b % ( ! d e f g h i jW K @ 6 > Q O 9 Q ; < 6 @ K A O 9 G O 4 Q 3 9 @ N O ; 5 4 N K 4 O K A k Q 4 @ : 9 A 6 O ; Q < 9 Q l Q ; < 6 @ K A M P Q @ Q 6 9 A 6 ; K 4 Q ; < 6 @ K A V 3 K A 5 5 ;3 @ O ; 6 m 1 n o ; 3 3 K M 6 5 ; 6 M 9 < 6 @ K A M P Q @ Q 6 9 A 6 ; Q 6 5 ; > Q 3 4 N 9 G M L Q 5 ; A K ? N M ; 4 T ; Q Q 9 @ Q l < ; 6 6 ; : 9 O ; 4 M ; Q 6? @ A K M P ; G 9 M 4 A < K ; 3 3 @ < @ ; A 6 [ 1 p ; 6 K A 9 G G O @ ` 4 ; 4 A < K ; 3 3 @ < @ ; A 6 5 ; Q P < 4 M @ 6 P Q 4 M O o 9 < @ ; M 1+ q r - . / [ 1 p > Q 3 J , 7 γ8 , 9 : ; <

γ 8 , / = 1 2

s t t s u v w x w y z{ w | s } ~ y u wτ � � � � z w �τs � w u τ � � � � √3

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� � �� � � � � � � � � � � � � � � � � � �τ =

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