~ SpringerWienNewYork
CISM COURSES AND LECTURES
Series Editors: The Rectors Giulio Maier - Milan Franz G. Rammerstorf...
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~ SpringerWienNewYork
CISM COURSES AND LECTURES
Series Editors: The Rectors Giulio Maier - Milan Franz G. Rammerstorfer - Wien Jean Salençon - Palaiseau
The Secretary General Bernhard Schrefler - Padua
Executive Editor Paolo Serafini - Udine
The series presents lecture notes, monographs, edited works and proceedings in the field of Mechanics, Engineering, Computer Science and Applied Mathematics. Purpose of the series is to make known in the international scientific and technical community results obtained in some of the activities organized by CISM, the International Centre for Mechanical Sciences.
INTERNATIONAL CENTRE FOR MECHANICAL SCIENCES COURSES AND LECTURES - No. 517
INSTABILITIES OF FLOWS: WITH AND WITHOUT HEAT TRANSFER AND CHEMICAL REACTION
EDITED BY TAPAN K. SENGUPTA HIGH PERFORMANCE COMPUTING LABORATORY, DEPT. OF AEROSPACE ENGG. IIT KANPUR 208 016, INDIA
THIERRY POINSOT CNRS/INST. DE MECANIQUE DES FLUIDES DE TOULOUSE, TOULOUSE, FRANCE
This volume contains 133 illustrations
This work is subject to copyright. All rights are reserved, whether the whole or part of the material is concerned specifically those of translation, reprinting, re-use of illustrations, broadcasting, reproduction by photocopying machine or similar means, and storage in data banks. © 2010 by CISM, Udine Printed in Italy SPIN 12822072
All contributions have been typeset by the authors.
ISBN 978-3-7091-0126-1 SpringerWienNewYork
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>R_] ^RO NS]ZO\]SYX \OVK^SYX PY\ /[X ! S] ^RO ]^K^OWOX^ YP QY` O\XSXQ O[_K^SYX SX ^RO ]ZOM^\KV ZVKXO KXN ^OVV] _] ^RK^ ^RO ]MKVO YP ]ZKMO `K\SK^SYX KXN ^RO ]MKVO YP ^SWO `K\SK^SYX K\O XY^ SXNOZOXNOX^ KXN ^ROc K\O \OVK^ON 0Y\ WKXc Y^RO\ Z\YLVOW] ^RO NS]ZO\]SYX \OVK^SYX aSVV LO MYX]O [_OXMO YP LY_XNK\c MYXNS^SYX] K] S] YP^OX NO\S`ON PY\ aK^O\ aK`O] NO`OVYZ SXQ PY\ KX O[_SVSL\S_W ]YV_^SYX QS`OX Lc ^RO 6KZVKMO] O[_K^SYX /[_K^SYX !" SWZVSO] ^RK^ OKMR P\O[_OXMc MYWZYXOX^ aSVV ^\K`OV SX ]ZKMO aS^R ^RO
#"
MY\\O]ZYXNSXQ ZRK]O ]ZOON +Xc ]c]^OW ^RK^ RK] \OVK^SYX]RSZ ]RYaSXQ ^RK^ ^RO ZRK]O MY\\O]ZYXNSXQ ^Y OKMR aK`O X_WLO\ ^\K`OV] Lc ^RO ]KWO ]ZOON S] MKVVON K =>= 38B?4AB8E4 BHBC4< 3X MYX^\K]^ K 38B?4AB8E4 BHBC4< S] YXO PY\ aRSMR NSO\OX^ P\O[_OXMc MYWZYXOX^] ^\K`OV aS^R NSO\OX^ ]ZOON ]_MR ^RK^ KXc MYWZKM^ NS]^_\LKXMO K^ H ) aSVV LO PY_XN NS]ZO\]ON K^ K VK^O\ ^SWO 9XO MKX QOXO\KVSdO ^RO KLY`O PY\ K ]c]^OW ^RK^ NS]ZVKc] L\YKNLKXN NcXKWSM] 9XMO KQKSX PY\ ]_MR K QOXO\KV ]c]^OW ^RO QY`O\XSXQ NSO\OX^SKV O[_K ^SYX] KXN ^RO LY_XNK\c MYXNS^SYX] aSVV NO^O\WSXO ^RO 38B?4AB8>= A4;0C8>= 9XMO aO RK`O ^RS] \OVK^SYX S^ S] ZY]]SLVO ^Y ^KVU KLY_^ ^RO QOXO\KV Z\YZO\ ^SO] YP ^RO \O]ZYX]O OVN 6SQR^RSVV&$% 6O^ _] MYX]SNO\ ^aY XOSQRLY\SXQ aK`O X_WLO\] ? KXN ? YP ^RO \O]ZYX]O OVN 0Y\ ^RO ZRc]SMKV Z\YLVOW \O]ZYX]O OVN NOZOXN] MYX^SX_Y_]Vc YX ^RO PY\MSXQ KXN K_bSVSK\c MYXNS^SYX] 2OXMO ^RO MY\\O]ZYXNSXQ MS\M_VK\ P\O[_OXMSO] KXN K] YL^KSXON P\YW ^RO 38B?4AB8>= A4;0C8>= aSVV KV]Y LO ^aY MVY]OVc ]ZKMON XOSQRLY\SXQ ZYSX^] SX ^RO P\O[_OXMc ZVKXO AO NOXY^O ^RO MY\\O]ZYXNSXQ \O]ZYX]O MYWZYXOX^] Lc : ) 5 MY]? L H
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: ) 5 MY]? L H
!#L
AO MYX]SNO\ RO\O YXVc ^RO \OKV ZK\^ YP ^RO \O]ZYX]O OVN + WY\O QOXO\ KVSdON \O]ZYX]O LK]ON YX ^RO ObZ\O]]SYX ! aSVV RK`O KV]Y KX SWKQSXK\c MYWZYXOX^ ]SQXSPcSXQ ^RO ZRK]O ]RSP^ YP ^RO Y_^Z_^ aS^R \O]ZOM^ ^Y KZZVSON SXZ_^ 3X ^RO KLY`O O[_K^SYX] LY^R ^RO MYWZYXOX^] RK`O LOOX K]]_WON ^Y RK`O ]KWO KWZVS^_NO ^RO NSO\OXMO LOSXQ XOQVSQSLVO K] aO K\O MYX]SNO\ SXQ ^aY MYWZYXOX^] ^RK^ K\O ]OZK\K^ON Lc KX SX XS^O]SWKV KWY_X^ SX ^RO ]ZOM^\KV ZVKXO >RO ^Y^KV MYX^\SL_^SYX MYWSXQ P\YW ^RO]O ^aY MYWZYXOX^] S] ^ROX QS`OX Lc : ) : : ) E5 MY] ? ? L HG MY] ? ? L H !$ >Y^KV OOM^ YP ^RO]O ^aY MYWZYXOX^] ]RYa] _Z K] K MYWLSXK^SYX YP ^aY PKM^Y\] YXO YX K ]VYa ]MKVO QS`OX Lc ^RO \]^ [_KX^S^c SX]SNO ^RO ][_K\O L\KMUO^ KXN ^RO ]OMYXN [_KX^S^c ^RK^ `K\SO] YX ^RO Y\SQSXKV ]MKVO QS`OX Lc ^RO ]OMYXN MY]SXO P_XM^SYX +] ^RO ^aY MYWZYXOX^] K\O SX XS^O]SWKVVc KZK\^ SX ^RO ]ZOM^\KV ZVKXO ^RO ]VYaVc `K\cSXQ ZK\^ MKX LO `SOaON K] ^RO KWZVS^_NO YP ^RO ^Y^KV OOM^ +] OXO\Qc YP K aK`O ]c]^OW S] Z\YZY\^SYXKV ^Y ^RO ][_K\O YP ^RO KWZVS^_NO YP ^RO aK`O YXO MKX `SOa ^RO OXO\Qc YP ^RO ]c]^OW ^Y `K\c PYVVYaSXQ ^RO ZRK]O `K\SK^SYX YP ^RO KWZVS^_NO >RO\OPY\O ^RO ]ZOON
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YP Z\YZKQK^SYX YP OXO\Qc S] QS`OX Lc ^RO \K^O K^ aRSMR ^RO ZRK]O YP ^RO KWZVS^_NO MRKXQO] KXN S] QS`OX Lc
03 )
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>RS] S] ^RO Q\Y_Z `OVYMS^c YP ^RO ]SWZVO ]c]^OW MYX]SNO\ON RO\O aRO\O ^RO ]ZK^SKV `K\SK^SYX S] KVYXQ K ]SXQVO NS\OM^SYX KXN ^RO Q\Y_Z `OVYMS^c NS\OM^SYX S] QS`OX KVYXQ ^RS] NS\OM^SYX 0Y\ ^RO YXONSWOX]SYXKV ]c]^OW SX ^RO VSWS^ aROX ^RO aK`O X_WLO\] YP ^RO ^aY MYWZYXOX^] K\O YXVc 8? KZK\^ SX ? ]ZKMO ^ROX YXO MKX MYX]SNO\ KX O[_S`KVOX^ \O]ZYX]O OVN MOX^O\ON K\Y_XN ^RS] MV_]^O\ KXN K QOXO\KV ObZ\O]]SYX PY\ ^RO Q\Y_Z `OVYMS^c S] QS`OX Lc 8 !% 8? >RO Q\Y_Z `OVYMS^c PY\ W_V^SNSWOX]SYXKV Z\YLVOW S] K `OM^Y\ NOMSNON Lc ^RO `K\SK^SYX YP MS\M_VK\ P\O[_OXMc aS^R ^RO aK`O X_WLO\ `OM^Y\ 3^ S] YXVc ^RO \OKV ZK\^ YP /[X !% ^RK^ S] ^O\WON ^RO Q\Y_Z `OVYMS^c K] NS]M_]]ON SX ARS^RKW &$% >R_] ^RS] S] ^RO `OVYMS^c K^ aRSMR ^RO OXO\Qc YP K Q\Y_Z YP aK`O] ^\K`OV MOX^O\ON KLY_^ ^RO WSNNVO YP ^RO aK`O X_WLO\ Q\Y_Z 3^ S] XY^ON ^RK^ ^RO YXONSWOX]SYXKV aK`O QS`OX Lc /[X ! S] XYXNS]ZO\]S`O aS^R 03 ) 7
,DB: #CHI67>A>IN &:8=6C>HBH
2O\O ^aY ]SWZVO MK]O] YP SX]^KLSVS^SO] K\O MYX]SNO\ON ^Y OWZRK]SdO ^RO MYXMOZ^] NO]M\SLON KLY`O AO LOQSX Lc NS]^SXQ_S]RSXQ ^RO NSO\OXMO LO^aOOX ]^K^SM KXN NcXKWSM SX]^KLSVS^c Lc MYX]SNO\SXQ ^RO ]^KLSVS^c YP K^WY]ZRO\O K] KX ObKWZVO AROX K ZK\MOV YP KS\ SX ^RO K^WY]ZRO\O S] WY`ON \KZSNVc P\YW KX O[_SVSL \S_W MYXNS^SYX KXN S^] ^OXNOXMc ^Y MYWO LKMU ^Y S^] _XNS]^_\LON ZY]S^SYX S] XY^ON ^ROX aO ^O\W ^RO K^WY]ZRO\O K] ]^K^SMKVVc ]^KLVO >RO WY`OWOX^ YP ^RO ZKMUO^ S] MYX]SNO\ON K] SWZ_V]S`O ^Y Z\OMV_NO KXc ROK^ ^\KX]PO\ P\YW ^RO ZK\MOV ^Y ^RO KWLSOXMO >RS] ^OXNOXMc YP ]^K^SM ]^KLSVS^c aROX ObS]^] S] N_O ^Y ^RO L_YcKXMc PY\MO MK_]ON Lc ^RO NOX]S^c NSO\OX^SKV N_O ^Y ^OWZO\K^_\O `K\SK^SYX aS^R ROSQR^ KXN ]_MR LYNc PY\MO KM^] _ZYX ^RO NS]ZVKMON KS\ZK\MOV
#"
3X ]^K^SM ]^KLSVS^c ]^_NSO] aO NY XY^ VYYU PY\ NO^KSVON ^SWONNOZOXNOX^ WY ^SYX YP ^RO ZK\MOV PYVVYaSXQ ^RO NS]ZVKMOWOX^ K] ^RO K]]YMSK^ON KMMOVO\K^SYX] K\O MYX]SNO\ON XOQVSQSLVO
NC6B>8 ,I67>A>IN D; ,I>AA IBDHE=:G: 0Y\ ^RO NcXKWSM ]^KLSVS^c ]^_Nc aO MYX]SNO\ YXMO KQKSX K ZK\MOV YP KS\ ^Y LO K^ O[_SVSL\S_W K^ K ROSQR^ N KXN S] NS]ZVKMON ^Y K ROSQR^ N ^Y PYVVYa S^] NO^KSVON ^SWO RS]^Y\c YP WY^SYX AO XY^O ^RK^ ^RO WY^SYX S] MK_]ON KQKSX Lc ^RO L_YcKXMc PY\MO MK_]ON Lc ^RO ^OWZO\K^_\O `K\SK^SYX YP ^RO KWLSOX^ KS\ QS`OX Lc . ) . N 2O\O ^RO `O\^SMKV NS]ZVKMOWOX^ YP ^RO KS\ZK\MOV S] KXN ^RO NcXKWSM] PYVVYa] ^RO PY\MO LKVKXMO O[_K^SYX
g ) ; F
"
aRO\O g S] ^RO SX]^KX^KXOY_] KMMOVO\K^SYX ObZO\SOXMON Lc ^RO ZK\MOV YP KS\ .OX]S^c YP ^RO NS]ZVKMON ZK\MOV S] MYX]SNO\ON ^Y LO QS`OX Lc aRSVO ^RO KWLSOX^ _SN RK] ^RO NOX]S^c ]Y ^RK^ ^RO \SQR^ RKXN ]SNO YP ^RO KLY`O O[_K^SYX \OZ\O]OX^] ^RO L_YcKXMc PY\MO /[_SVSL\S_W ^RO\WYNcXKWSM] ^OVV] _] ^RK^ PY\ K ]SWZVO MYWZ\O]]SLVO ]_L]^KXMO aS^R YXVc YXO WYNO YP aY\U KXc ]^K^O Z\YZO\^c MKX LO \OZ\O]OX^ON Lc KXc ^aY Y^RO\ Z\YZO\^SO] KXN VO^ _] MYX]SNO\ ^ROW ^Y LO ^RO Z\O]]_\O D KXN ^RO OX^\YZc G >R_] _]SXQ K >KcVY\ ]O\SO] aO MKX \OVK^O ^RO NOX]S^c YP ^RO KWLSOX^ KS\ K^ ^RO ^aY ROSQR^] K]
N ) N D
EDN DNG G ?
EGN GNG " <
9XMO KQKSX aO aSVV K]]_WO ^RK^ ^RO NS]ZVKMOWOX^ Z\YMO]] YP ^RO KS\ ZK\MOV S] S]OX^\YZSM ^RO\O K\O XY `S]MY_] Y\ ROK^ VY]]O] K]]YMSK^ON aS^R ^RO \KZSN WY`OWOX^ YP ^RO ZK\MOV KXN ^R_] PY\ ^RO KS\ZK\MOV EDN DNG "
N ) N D ? 3X /[X] " KXN " WOMRKXSMKV O[_SVSL\S_W OX]_\O] ]KWO D KXN N ) N >R_] ^RO NOX]S^c NSO\OX^SKV MK_]SXQ ^RO L_YcKXMc S] QS`OX Lc 8G "! EGN GNG ) F ) G < G < 8N AO MKX KV]Y \OVK^O ^RO NOX]S^c YP ^RO KS\ZK\MOV K^ ^RO ^aY ROSQR^] K]
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N ) N
D
8D 8D ) N 7 8N ? 8N
aRO\O 7 S] ^RO ]ZOON YP ]Y_XN /[_K^SYX " MKX KV]Y LO a\S^^OX SX ^O\W] YP ^RO ]ZOMS M `YV_WO J ) _]SXQ /[X "! K] J 8D ; J 8G ; g ) F )
J G < 8N 7 8N 0\YW ^RO WOMRKXSMKV O[_SVSL\S_W ZVS ON ^Y
0< 0F
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B ?
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+VV ^RO]O ]SWZVS MK^SYX] VOKN ^Y ; g ) J
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8. ; ; 8N < 7
3P aO P_\^RO\ MYX]SNO\ ^RO ]ZOON YP ]Y_XN 7 ^Y LO `O\c VK\QO ^ROX ^RO KLY`O O[_K^SYX MKX LO P_\^RO\ KZZ\YbSWK^ON ^Y
#"
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g ( )
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AO MKX MYX]SNO\ ^RO PYVVYaSXQ ZY]]SLSVS^SO]' aRO\O ( -K]O' 3P ( ^ROX ^RO NcXKWSM] YP ^RO NS]ZVKMOWOX^ aSVV LO Z_\OVc Y]MSVVK^Y\c SWZVcSXQ XO_^\KV ]^KLSVS^c YP ^RO ]^K^SM K^WY]ZRO\O -K]O' 3P ( ^ROX ^RO `O\^SMKV NS]ZVKMOWOX^ aSVV `K\c K] H ) 9 ! @ 9 ! @ aRO\O ^RO \]^ MYWZYXOX^ MVOK\Vc SXNSMK^O] SX]^KLSVS^c ( S] MKVVON ^RO AD=C EJ 08BJ 0;J 0 Y\ L_YcKXMc P\O[_OXMc +] QS`OX KLY`O PYVVYaSXQ >RYWZ ]YX &$ aO MKX YL^KSX ^RS] P\O[_OXMc aS^R KS\ ^\OK^ON K] KX SNOKV QK] Lc ; ; 8. ( ) "# . 8N < 0Y\ N\c KS\
3
) 5WO^O\ KXN ROXMO PY\ ]^KLSVS^c YP N\c K^WY
]ZRO\O ^RO ^OWZO\K^_\O NS]^\SL_^SYX RK] ^Y LO ]Y ^RK^ 0' 0F 5WO^O\ 0' >R_] 0F ) \OZ\O]OX^] ^RO LY\NO\ VSXO YP SX]^KLSVS^c KXN ^RO X_WO\SMKV `KV_O YX ^RO \SQR^ RKXN ]SNO aS^RSX ^RO ][_K\O L\KMUO^ S] ^O\WON K] ^RO N\c 0? KNSKLK^SM VKZ]O \K^O LOMK_]O ^RS] OX]_\O] 0F )
$:AK>C ":AB=DAIO #CHI67>A>IN >RS] K\S]O] aROX ^aY VKcO\] YP _SN] WKc XY^ LO YP ]KWO ]ZOMSO] Y\ NOX ]S^c K\O SX \OVK^S`O WY^SYX >R_] ^RS] S] KX SX^O\PKMSKV SX]^KLSVS^c KXN ^RO \O]_V^KX^ Ya POK^_\O] N_O ^Y SWZY]ON NS]^_\LKXMO aSVV LO W_MR WY\O MYW ZVSMK^ON N_O ^Y \OVK^S`O WY^SYX :Rc]SMKV \OVO`KXMO YP ^RS] Z\YLVOW aK] ]OSdON _ZYX Lc 2OVWRYV^d %#% aRY YL]O\`ON ^RK^ ^RO SX^O\PKMO K] K ]_\ PKMO YP ]OZK\K^SYX ^OK\] ^RO Ya 0BD=34A =YWO^SWO VK^O\ 5OV`SX %$ ZY]ON ^RS] Z\YLVOW K] YXO YP SX]^KLSVS^c KXN ]YV`ON S^ AO PYVVYa ^RS] VK^^O\ KZZ\YKMR RO\O >RO LK]SM O[_SVSL\S_W Ya S] K]]_WON ^Y LO SX`S]MSN KXN SXMYWZ\O]]SLVO K] ^aY ZK\KVVOV ]^\OKW] RK`SXQ NS]^SXM^ NOX]S^c KXN `OVYMS^c YaSXQ YXO Y`O\ ^RO KXY^RO\ K] NOZSM^ON SX Q_\O LOVYa ,OPY\O KXc ZO\^_\LK^SYX S] KZZVSON ^RO SX^O\PKMO S] VYMK^ON K^ N ) KXN ]_L]O[_OX^ NS]ZVKMOWOX^ YP ^RS] SX^O\PKMO S] ObZ\O]]ON ZK\KWO^\SMKVVc K] N? ) HL M H ) L M H
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#
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x Fluid-1
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5F9 6CIB898 5G N
"
>RO Y^RO\ ]O^ YP LY_XNK\c MYXNS^SYX S] KZZVSON K^ ^RO SX^O\PKMO aRSMR S] ^RO XY _SN ^R\Y_QR ^RO SX^O\PKMO MYXNS^SYX SO H f6 H f6 H f6 ) " H N L L M M 3X KNNS^SYX SX ^RO KL]OXMO YP ]_\PKMO ^OX]SYX Z\O]]_\O W_]^ LO MYX ^SX_Y_] KM\Y]] ^RO SX^O\PKMO ?ZYX VSXOK\SdK^SYX ^RO SX^O\PKMO LY_XNK\c MYXNS^SYX " ]SWZVS O] ^Y 6 /6 ) : CF > ) " H L N aRO\O f6 KXN 6 K\O K] \OVK^ON SX /[X "% .O XSXQ ^RO Z\O]]_\O YX ^RO OS^RO\ YaNYWKSX Lc _X]^OKNc ,O\XY_VVS] O[_K^SYX YXO MKX a\S^O f 6 D6 ) 6 6 f6 ; H " H
#"
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=SWZVSPcSXQ KXN \O^KSXSXQ _Z ^Y ^O\W] aO QO^ ^RO PYVVYaSXQ MYXNS ^SYX] 7CB8=H=CB ' / ) /
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-Y\\O]ZYXNSXQVc ^RO ZO\^_\LK^SYX `OVYMS^c ZY^OX^SKV S] ObZ\O]]ON K] 6 L M N H ) 46 N H95 DE 8 8 "# A\S^SXQ ? ) KXN _]SXQ /[X "# SX "& YXO QO^] ^RO ]YV_^SYX ^RK^ ]K^S] O] ^RO PK\]^\OKW LY_XNK\c MYXNS^SYX] " K] 46 ) :6 H97F : CF > ) 5B8
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?]SXQ /[X "" SX ^RO SX^O\PKMO LY_XNK\c MYXNS^SYX " YXO QO^] I = /
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>RS] Y\NSXK\c NSO\OX^SKV O[_K^SYX PY\ ^RO ^SWO `K\SK^SYX YP ^RO SX^O\PKMO NS]ZVKMOWOX^ MKX LO _XNO\]^YYN LO^^O\ SX ^O\W] YP S^] 0Y_\SO\ ^\KX]PY\W NO XON Lc H 95@ 8 H ) " 9XO YL^KSX] ^RO PYVVYaSXQ NS]ZO\]SYX \OVK^SYX Lc ]_L]^S^_^SYX YP " SX " K] / / ;? / / )
"
>RS] Z\Y`SNO] ^RO MRK\KM^O\S]^SM ObZYXOX^] SX " K]
/ / )
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,K]ON YX ^RS] NS]ZO\]SYX \OVK^SYX ^RO PYVVYaSXQ ]_LMK]O] MKX LO MYX]SN O\ON' -+=/ ' AROX ^RO SX^O\PKMO S] NS]^_\LON SX ^RO ]ZKXaS]O NS\OM^SYX YXVc SO ) KXN ^ROX ) ;
""
>R_] ^RO ]^\OKWSXQ `OVYMS^SO] / KXN / NY XY^ KOM^ ^RO \O]ZYX]O YP ^RO ]c]^OW 3P SX KNNS^SYX SO K ROK`SO\ VS[_SN S] Y`O\ K VSQR^O\ VS[_SN ^ROX ^RO L_YcKXMc PY\MO MK_]O] ^OWZY\KV SX]^KLSVS^c SP S] MYX]SNO\ON \OKV K] S] ^RO MK]O PY\ KcVY\ SX]^KLSVS^c ]OO -RKXN\K]OURK\ -+=/ ' 0Y\ K QOXO\KV SX^O\PKMO ZO\^_\LK^SYX SP ;? / / ^ROX ^RO SX^O\PKMO NS]ZVKMOWOX^ aSVV Q\Ya SX ^SWO >RS] MYXNS^SYX MKX LO KV^O\XK^OVc ]^K^ON K] K MYXNS^SYX PY\ SX]^KLSVS^c K]' / / 37
>R_] PY\ K QS`OX ]ROK\ K^ ^RO SX^O\PKMO QS`OX Lc / / KXN PY\ K QS`OX YLVS[_O NS]^_\LKXMO Z\YZKQK^SYX NS\OM^SYX K^ ^RO SX^O\PKMO SXNSMK^ON Lc ^RO aK`O X_WLO\ `OM^Y\ ? SX]^KLSVS^c aY_VN YMM_\ PY\ KVV aK`O X_WLO\] ? QS`OX Lc
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