what causes a sack

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    J)%$5/)4 D6$/2(5(

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    47A*5*4 ;A$; &3%1)%*' $;9

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    KL!O 12 B1;$) $7>4G Q[O 12 B+$'&;&13$) D)17>&3? $7>4M

    R3 ;A&4 4&;8$;&13 $ 4$7> E&)) 1778+ &3 $3 $%*+$?* 12 LJL 4*713'4G 514; )&>*)9 =9 $ ;$7>)* EA1 E$4 =*$;*3

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    7*3;*+G ?8$+'G 1+ ;$7>)* EA1 E$4 =*$;*3

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    B0(5%506 0A %#) B/$2)1 "#0 M$( 7)$%

    31$45%506$/ 7/0+,568 O >)?)1$8)4 O &3? $7>4G ZO 12 B+$'&;&13$) D)17>&3? _ I*%*+$?*' $7>4M

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    ?8$+' 1+ ;$7>)* EA1 E$4 =*$;*3

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    31$45%506$/ 7/0+,568 O 4G /O 12 B+$'&;&13$) D)17>&3? $7>4G -/O 12 B+$'&;&13$) D)17>&3? _ H*8;+$) $7>4M

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    7*3;*+G ?8$+'G 1+ ;$7>)* EA1 E$4 =*$;*3

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