100 strings, 100 chars each

JavaScript performance comparison

Revision 31 of this test case created

Info

Different ways to concatenate strings together

Preparation code

<script>
  var arr = ['RPKGQAREWXKVCSLNRTQKFRTXMIFQKHOCWYINZARVXCQZUCNMVDWBVQZHYEYJMNLIMUVLVNHSPXSKAGWVJTXEJWMIBLRNYDVKYRWT','EDMUBEEBKBXUUUZERMNSXFFWIBHGSDAWGMRIQWJBXGWSBVWSIKLFPRBYSJEKMFHTRZBHVKJSRGKTBHMJRXPHORFHAKRNPZGGYIOT','TXMKDXEFEQPWOFDCWJJXTBKIBROAZCUTAGEEDIKIYAFMFJPCSZZLBKUCCICCLXVLDZQHHAQGAWTGFIIYIIKJTELVMOXXLSJPSAXZ','AOGBKZIQHQPPZZZSDLNQZLOLEXBWXZVYOBAZBIQIZFYYEYQIJEYJQMUUKWQHWMGKOGJPPZYOFXMJVDRFIPOYCJTMFKUCWANLHXBW','WZKCXXLTADYJTMIVVBHBLCDICQUJNVGKVQNSNYLOCKYVWGRRIZTUBXDEOXNCSUNNKAGYZSNBCLXYSOQAOKVPHYTVVHXOBKCMLIKK','BYLDKICCXSDLCYBKWVGSCDGEOJQZRBKTAVWKEYMCRPNUOPEKKKDNOKRDTIDLKNEKJAUNZHQQWELLTQWDBZRQJITCRXOBKSLUTFHS','NXJJBVVVLRZMQQCAYWDQTRREJCYDIGWVEFFGBABMRAZIRCJPYMFSDXWNZVQIBNEFTJLUKNHCOGLFIUVHGBZKYVXYROGSBKYVUKPF','XWHLCSRLMMSTNRDLNBJEQQXSBVNWFCBDYIPBBGMOSFHFXKRLMBQCRNUTJIPOKRRJAGKBNXQFCXKAICLUDBXVOSPXAFMKWETWLEYY','CODFMOFURQPURMQGEFEEKQPHVJEGOCFQRJVDXAXORMJJZAQDFUIQLYXGHBNVETLVCHYZIWOZIYIIYYMETUUESSLAUZVYSHUUOSUW','PJWXHFGGDSKXMECFXOFRNBQGIKBXDWTSFPQNUWTYPDWCIYHGMNYAPOGXZIUDEOWKENXYKRXZVTBERJKEXIEMXLKXTFAYTXIXKGWV','XTUTNWXEGHJDQNQNZAKTFLRZIAWTGSOEMJXZFVEMDNPTBGGAGRTMCLLKLIERBSWNBUMHPRTSEJLGPSHVJAIMMUWXCAPDTLQUGDCV','VVOZEAGUTNQCOYOASLXUMNYGZOBFSDBNZPNEQUYJHOMVNBWFNTAAGYGGNHLGLMUKCHOSBMCJBOFOQBUDUUDBTKHHRTNCFHNHPBAR','OCAQRFEHGYLBTPDNZLUREHTKPGSEISWXVWNNCRVJQGKKWOXVZSNEAGOPNGUWYRTUNGHQYCZPJKZGYXBYPOCQVQFJWAGVRZPFGXWE','AVUKGTQFRSDHHFXDVDMSDTNVTDBZAXEATYKASAFJTIQANNDJQQCUJPQCTRBTPGUJEFJXGOGZWXZKLCUCSWWBMNEFEFZUMTDRYMOF','AVEXTDIEGCGYZDAMQESVKRPWLSNJECOFXTCQWKUDNBBNFCZVHRQRJGOUYBECDSHBMKRIVMLJONWTQWPXOGOXMDRKEVNIOVJAFBJB','OVKCJHVZEKWSRLQDOINTEACTVMTBNDCBZNDIUZHYKEQBQHEFPSZTSBMOOGPBKSDJFHSAGZYREPTVWXBMPAFICSXQZNSJFVTLCLLJ','LKBPZULWRMIHNOQQHNGGBZPHVISYTEHEOJUNDGJVTSDGGTWNHDUICJPYSIWMMDRANMOQSYLLQOSXIOLQSGZVQPTIXPVKTMKGZZXS','XIDOXWMGKYWDEWZULSDIIYSCLDJLDGDBPGPNCCTNBQRFMQAXJDGRCZUOCDZGJDHZJXMMZFAAVSGIIHFSLMJOLECOHCURFBQPYCCY','IDZEVGMENSWYEGMPKPDRRYJXZZNYCPWLSWPOCCSPUPOZVAOFPSXHRHFQGSPJIMUAIJPKLIAGXOFTPUZENWMEDSVKKKTSXOTFYIQK','RRQOFWHURGZFDMJHEFSOQMHNAATYJKIABZPHVXBNEBSHNCPRIHGYTNMUOFSYQBZRAOYWMAJQBCYPFNGNVNLOAYIPEBNUCNMCBLZO','LIENLCCQQJDLWPAXNJMRKAMNNYQPJPDVYIJJKLABVDMSTMPGVCYGDLUQJKGTZKPYSYIDKIEFLQXEDNLZPKFSVAJFKPYKZOISMQVX','YZCKQAPUOBTDMZWHZGNJWLUVADNMTJJSIMDZNSTBUMFGMCOLIBVENQANTOZNXJFGVJFJCYKWLQCYSQJBRFGFVGSOURBSBHYXQEGS','DRPPHRNAIXBACHFYOXNJPOBQWAONFUGILVYTMLUVIVVLDBKSYXBOMDFJDTWJOCRAXPTKBOGKKCWNDGGCDHQQKWZOPVXEYPEVFYGH','MMRWONKRTQUXXKNIHNXXIVBGLFCQEIXQVPMJCXBWNVTLGHUOURLDMMKXSMOWVMNQBAAEXCBKXVWECQSXHDAUQLSIXGFTTSJVSKZP','MAAKVWOYNHWULXOBIGKFNQYGIICBSBRECRPYODXBLTWWQLYYSJEFZDMIMOKEQBJTTYRHCPJOIFLZQJXITCOTGBCSQMWGNGZGFROH','GXVODGOUQLDKORDUTGMJSJPGPPMUGBCNZYCDFQXVCAGQSJLLPXUIHKOXZBSGCVTCTVFYMCUODAFVKQHAOCIVMXTMYLSBGMDZIIYU','LTJOTOKEERESUNOGKHTITLJZYMZGVYBGRKVKYFODXTWRGLYQSRZLDILBVLIRJJXAUTKTYZWWSTNZEMPWDPIGXUITFQKOAIOUBZOA','ZLWSEKRIWHEAWNHUIPONFZCGIRBKQPKQAHIESAMPHRPEFXYNMMBSLEYUVAEMQOCQWLVPLIESAUXGRVUDIVWUZVOUVSHLHJCEUXTF','GXYGSVMJRGNZCJUCFJXABEMJOONIMHOSFNYXJLHASUAVEVXJEUKFZWPNKCVWKKPPXNMGZTHSOINTDKCHFNNEJDRUGNQQXFFVTRCT','LJLZSYSVJVDOIRTSUKMAXCRVIWQCOTVZCHZVFSRPOVDXMWPHHBIFEZAMVRPJKKJNSJIXBANQVRNIOCPVDXBHXBUSTJCEUMRMVAKX','AYNVPADDDTZGRAOOCJHWTKAOWRASSLPTJDPYDTCGMBNDCCSELAAEKASHSTZLFPEOSTNWMQCZSQDUSVZEVAJGACNTVNEBCJQVCERP','UUOMKRHDNGHJGQQHSEBORGPUPGPSKGIEBXRMPYPCFXMMOCTHGVWYBMSRSIKCPSHQPYCEXSHCPTPEWJLDEHBGTUXLCHORAVIPTKUR','CBUSVJWSSHVWPXDJSAUUIJMIEUYYFSPITJAOSXGLFCIUALDSMYNUHZCMUAKZSAIMJIBCFIOLKWFKHJDTIQOQPQCKRNKKNSXWAYZG','GNSRKXBRHELPVZFKQIVIVFTIXQFYOEFUSXMCUNUCSGRNFXYWFTFAZYJWOOUCTZXLXJORXIUQOLEUJDROXWPWUYTJNOLGOJSLTHDR','PXIEIMZRQQGNNVKHUDRHRDOFMGQGNUXDRFIASHSIYYVLUFTOJKVANJGAQXGEREIJKQJDXBLVAHHVNAKWKFXYPEYGCFLTKTDVJMYH','OJDPRKKELUBWAZUQDTXFZIZJBCELPCTDMXTDHEITYJPZIJQMDNRCWRMYTQKITDMGAGJIKSBJBRIKBZWENOGJFSIZJSIDWVJWBTFL','LHUNYDXACUEQJLAPEIOOBXRXSBUUUZFGHZTGDRGGMLWVWWKBFZPGXHDPIYJDYPKFPDMSVSYHDVDASOCXNREKZHAIGKLEZVJPZVHV','OGDSCGSUUVRIMVTMDUUJFFNEBXTBTBXHIAZKHSECNWLASEMWZHGEMTJORDQKFNRNORXVKCYXYJYQOLNNSTRFNBUEEKPJYHWMYUII','WGGVPEMDQZRISJNFKHKOSZYQGVDEQLNMSUHIZTMPTDXLMKRWSBLKAKAHFELVQZIITQRSKDIDGFPTQHPIIBTJLTQRXCNOCWWWMNPW','RXAXCQQTXGCFIVPTPFLNIZBKVXGHLVECSFAVVRPSYRXGMNACSLPBLQLGOSOZOTCHYCDTUSLSKJYXXZZQKORWEDCSWRSKKURIXUCR','NOKXYIUVHTLSHCOMGRECIWMTRECOZEGMTQKRYFMGYYZGAOSGGXJPUVILAKAZPGMIWWZVCMCAKBHLQARWYALSWTEWEEWTLIBHFBDH','NFIXHPIXQATOBEHYYLUCQQVCZXJEYNLMSTKAJSXZTQOVVVTTHOWXFRZEPJINWUZPNJPXCNWWDKRZGLSNZOKEGKIVURJRLJGZTWWV','JTSNEKMKVFXVUIAATJWNAFEMPLLIIIDRBWFGGRQCWOYRWYRQHODIUHUJTGRBOVTQRYXYPNAMCYEZXVPFKSNEAINTPFVEAOVRMSQC','GQPIPTHNPWSZPGEPPSJEXFIXTEPGWFJCWYKMSSZHOSHDYMTNEDSBIBYCFNIBTSEPROCJHBRVTZZSLTGPWYRFZPHEDQGWIKMZZOJG','QACKABCLVIBSHSXGIFLLWRIEBVEAJOHAPJKPKNBGWCYDVWKDBVPYNXDOTHPDWWDLFOAQBCXXEVAASKDUGSSTQVIKDXNZURLAFMRG','OODTKETCPWWVPPOGKWQOUEOPVZPALHHZVKSGPLIEIFZYVOEGLVUFZIUVIKVTRCSMNLTDWBHFHHDDVIJHDDMDMHZURVOJYGWLSPOO','RWUYDXCZFLGJPTNBAMWSHKBGRXRJMGYDDSCHQEHWQOFFHTHIGDBOODUFAMONTNRWFUDVZLRPZXVHRCQXGRLUUFZVROJKBAHHVKDV','WVKVSGDJITHPKSJFXJBPXKAZLHGGSJBOFMKYTNHCGPRRHAXFJYUHJUGUBNBUXDICQSAJFILMXCDECAJMZETIZACBNEVKHDMXWMGB','URNSURWXSGJSLDAKDDMRHHBOLNLHASJVJXNDPKBHRKZCOANSDZJKHKZTYKAZDKUMHIQWSSEJCEMREZJHZSSHDRACCABFKWSSEJPX','BTHEYTVCTFKSYCZBUAEWAGCLCUEHETFFNMJLGFNZKXSIASKUSORTUTFXOJFSDKXQXHCDMQCWOVFONPJGEAZZUFWJOCCRMAIKHKNU','BQQPLWEZLNGPOGOJLLSZNURAUAKCLYWMONCAJGZVTGLIMASXLKXZFPAAPLDAJZNXNPXWVXSPDDYQDQNPBLOHAPIPALQJLEHYTFVP','DNFHQDXUULJVWYDXNLMOWDYHHFFBLAQOOWWFZTZTFIPCGSZUDLIAPGHXMNYXOPMCMIHLCGFIPVKVNJPRVYRKEZIQNHNBXAEJIMUL','TATIVDEJMUAHSSSWRANEHAGEBKNJXIVQJOZERDOEYOLQHENYFADMBJRDUFMSOHIXWICOLQSKFEBMIOLNPOARYSUTYHLNPULLCNZO','ESYJWAWFOHTEWUWUMROLZAYPUJBXXBMCTKLPKIVZPOELIBGVTVGSVFIQOJOMKAODLATWIPVYDAJLCQHVMNOHSXYHGMTQMIUXIOTR','DPPGQYSSPZOBNDJGAINHUHXHQSEYHYPKNERDDKWTKLVXPEEQNRXHZVOPNTOVRDFEIXIMHFFSRBQGGUWTMTALPPBCIPXZTDEBBNOI','SUBJVRQBLMUXGVJVKKYTZWSSAXUBKJKDDLMYDDZOQUMWPVSAFRTFNMYOKTPUCAXFMKEPNDDDYQANLSORKHWYUVMEOCZQDWWPHAEV','EIYDYZQKSFBCNYAHTNMIPLYTIVIPWNKBVJEUJVFBAGDNFEVYRHGHTFBBBJRXWCZSLDNUYSWZZAMEEHDWPJEIPFJQPAOLCNEORRJP','JFOIGBNKJQHYALHPRRGGRVSUJWJAOTPYZEHFFUQOKXNLJUBALHHDDZYMWIMLBCJBGQGMLWBWUPHDJIEVQLZTLYFIHSTIUCKBTQNE','NOAHDHKNQOJGAJZLIFUPXNYSPITIYHMLVNTZVDNLSXRTGRFPWZEUMCMCKGKJNXVJLOIGSWRLTIEAZJPWITQVWDXHJIQWFMFRBOXT','KOEEXJEXTUTBOKXKNURXCITIUZZVNXPYLUCJEHGXBAYQKWAXQSVTAOCVNBRBZGZKBCUFJACLABBLXCJNUEHUSJQGLHIKNIUOKPUU','PWGQXIBUKLIEPPZIYPPJWXTKFOZQDTKTQRKNZMIJXRONHOVGELPBIJLOYLFCFQWVHGJGTSQQJEEQSZWXKMYTWJIVVNYADUWLBGRU','YILIMPZFPWCAJATFKCBGQZHTUDFWKXQIFCRSSRYHNBHWCBCMEDTUDAOXETUOQKXWNPOFGMNTNVPPWSCBWVVZWJXACRPTCMPPBDVI','QIBEDRUAJWBFSWFPGDQIUFBXSRNUVICLRDQVVKVFHXKAUQPATFJOLLLDCZXXHAJZDZUZKQERNPRIFHJZNSNYDZBGYZEGZNFDNZCX','PHPDWHMCPVBCNPARPCXOCBVBPAFDAIBQPQULYGONBQPPGQGWTEKVGFWVGCYHKZYZQTLOZZBBQRRWIYSBCDWIJTEQVDXFDWFTPQIP','QKQGCIDKGVLIZIRICVYXZWDCSIWHZEXQOOWQWABCVMKVVCDXYBVXYYZQHVYHAVXPJUFGUHIQUTLPVOMTQIROHQFPMEWNZTCJOIPI','PYYJRKYNYLHPUYEBPKQCONPOGRYUZODPMBYELXSKJZADYFFOPVQEJFSPXQKXEOMRPLWBJOMTONWMSCAIYQMHWFXUVIRAWESLQONZ','CASQOPDHRDPPUCXRHULDCCEYHWKXKYWMZPDNEGUWJKMENJVVEGYGJDFQZPNJOKWNZAAEGVAQFMUTWQOAWNGGQLWPBKZPUWCUWDYD','YZTEMOXIEMIBZPHPBEFDPFSKBVEXYDBXCUBOJZWOLFQLVYBWCGARLSBMOGKNJLKMGMAPLXEXDUJYSKVVQVMCOOODVZQELAQSMRIY','PMWSGFRZQNUGJHIXVXARXRVJRMBEEJDTWAMCGDCWRWDADMXZKYQHPLRHYSMDCPWYQJBWNDTEZWECJCBTASBQDSYCLKFOACMQMONZ','RHDREHUNKWHKOJBSBZVNJABKDOBPCPOUWSMAAHOKDWVSFWKHWFUGGWQJLRZNGOIDGVEGCSRGOMYTJJAFOVMVRCFCUEQBSZEZUIGX','BXDPKBJTKKZZFMUXPZAJERKWRPWMXCJZZMOKOYEZIDYOQTMFTNOXEZUVOQHMSQLSDACSZGRIKPXAJJFCWUABTUWIKEVDVHVZIXRH','EIPOYNOHWUKTOKUIERRPVNTRVOQDMHLQPBFOOUVKOFEDQYMUPDKLRDCMSTPEAAVQCAEQVZAJFENWDZQTDBFUFIHXBXCBYYRAZVQU','VRDBVRXZQOSUPXOUFWSHTUIRSZRRVHLRYPSUGQTXEMRUKGPQCHXVBGNUFEMBMXSKNLFUBZRFMIZWPPNRWLNYRBTXFFYRCRCQCIKD','HBJTKJQZYERVPFTGGMEMRDEUUGKWOUAWWJPHTGHRKZMZEGGLTKYLNCFIJQFXLFTIPJPIPWAZWNZBTFMNQKYENEMWVRUGXOPMXEVN','BWNXJMYDSLRJWPNKUAGPRAWOOLBMQXZSTNQDZPHSBYCYOPIIPOXHPUWDGXQWVPPPCGTCVAVWZXUNNDWDRULGOHKVFARAQHPTNIWJ','JSFJQAWDDTHVNSCCZNXEOPFEXVYKEVUNNAWDBTGENOABGDEGQBLERQJPMIAQDUEQUBTVUAAIOAJVENCUPNZHEIWQRWGUQKKKLEFG','FGOUHYPLLRFBFFIJOEAFAGZQRKBCPHJUNYOUWDFIVLJBQSKFWKKXRKNIVPLKWVEJTSEPWJYSVITMAERXPCUHMIPIXBSUWWEPPIFM','SEENMYANCSKSUEZHNPPLQHFNEJCURIGJNKXZJYMMQXEKCDSPTHBJPGWUPZOHIURVFPVONIADFFNIIFXCNYLCFIWVILCQFULLJHAW','PAZUFNDOSAQGZCJFKGASRDJXXVIGCICRJBMPOPDHQUOQXXVIDWBUZKRWFACIIFZRHMGWCKDSFSJCPFLSBMNBWEYCFALNGKFNXLJZ','WNSCFBFVHQNJCBKZFICKJNYPYDDWPMVMAOOGQTBXJPGMQRMWZOHJCFZAJCXYPSLPHZWXSXUCMBODSAZSPGBRMASWCPVSIGIPFEMX','CHZPJOSBPSUEZVWLVOIYEDQMJZCODOMFWMUFAMHQEBUDWQPSFXRJAIVKHYZKNLQJYKPZXWPCXJGUAVNFTFOUNKEVIDGVPWFNHUNE','QCHOLNJMIXRCCFWQQBMYFSUUPZIXTVCKYJYKWIWFGNHISEZJGMHLEBGUAPRUKTEJDDTZLPERCMAVQAEWMMIRNOMODEIOXMYAPRAB','GFTJRUEIUJFHVNZJCLXGPGVNTTOJKOKQTEZLYETTNYAJMZSOLQVAXQOQJCZURKLKOLWMPPGDOGMAGFPSVKSSAGJKJIEASPLGAHTQ','WZULGGLNMBFILYBMFKWPSBPLRARSILIFKDQRJCEWDKEOJFBOPYDIZTTQUKICWRHHUXYEZDBDOFRXKTMARQIQJBHEMQGIINQDLOIL','SJOGOGDZZQAQGIHQKOUXFAGNOWRZKZKDJZJYFNYEDYUJHCZRRUPWUVKJRCJCBUGKTPJYCHCFFXPMZPERJTNEPYNHAXKCRQNKFWII','DLNJICWISAZBUNGJMURNRBQISDSXAAGELTNUWKCOKCQFQWPCQGPHIFQAJIYKJEOVXCPUMSJXUACKWRNNYDVGILGSUECDIRYGTOBG','GKDBKGMHYZUWCQCLCJDWNGZWXYCRMDXSOBUYIGFGFADIRFTTOXPCDPYANBRAEPTSRNRZTXGZYJHPPAIDYYGBOEBCFTCKIWDAJUZD','SGCQPJGEKOIJNOKBTLDYFGJOCMOMGOPZURPKBVOMKXVYLFZERDDXKMLMYAYFOOFJFUTHQITBFPZQVZVNDZKNMVALVZQKNWTTQMAH','UUIAJHREHMRKMCYYYYJUYAELWYFNLFUGADGJLXOSKGDWJBUHZDBYDFKZEPMPVHVVKBFVZUNJBQFKSARSDSQHYAHCQUSLBNHMPMHP','HVYIMETEEKWIDNPCNXEDRXPTKWFAJMPQIOYUSRZXCWGGJWIXTNBKKQEVNJVWWLMEZLZSDZQFVWMFSUCMHEXRUBNIKIEHURLTCLMG','KDMGZYMSSOEATCSODFWOOAVISHCVTOBESNKRLWKELPEERXSVCPKQQGYINBDHQELISWZESKIEZNJRKCMNRXDHDCQRDTYUYKCQGCUZ','MDEMRNDCPQPHNTPRWFJZYHUWSWNYYHYLLCXCPBEFRUNFNCXJHGJGODDGZRFYZDJKFHNUISAZMNFAPCJXITEWWIDWZIVYMEIRLVMT','OMTAAYAPBKNJDSGAAKWZTSXFWGWICICQVWQVVRLWBZGERNERXBRRTOWQVSZXBCOXYFSTWEPYDVDUIHLGJCXDRUUMMTKOVYLTEENA','ICYLYBFHJRNTULXLFRYSLJHGITAMXNNFQMROOXVYOJSJVPVBHUTSDBZMUZZRNMXDZPRNMNMBXEKSUFTBZNTCOSPJSOAFAYJANBNA','OABLFLEZQXAQLTTZMIIEWJKXITXWULXJLYVQKZPBXQRJKKJWSSBOCLLKFJHZUEJFDFWNFMODCFMMPVIINKWPVIAASIAMNKSQPODU','BSXDXJPNFYVTJSIEBJFTRGFEQXVGMYANQYROIHBNGXGPPPTQZZKRGPWWNRDAQEOHCFVLMXZSUGIKVCBVBLMHAIEOZHPPLDWOJSZW','PZPKFXUAZWVAHIIIQNWQUMFGPCVYVVULUJWZGRAGNWHUEPCVDZLYMREBUAAPWVBQFXQMOQSCNZWSPZNSZYQLPVNJWNZSIBIOYZAN','QSPDSMWHLJALHQXXMKHIXHBGIKVHJVUZNKDFWZNIJNTREQOQBWZZEBFMLBUUWOUKYYPVYDDHQXYUONLPKLOOMUBYVVSRKNBJMREK','UISLGRGUFSKPEYERTGPPBIGMVIVIAASVILGPCNKIFUYJTCBMJQBLYIXURSCRSVNBHTRKHBSMVQWOTXBCODNNLLHDDKUWGIYNCPXJ','QPWMGTBZRCCFFQSRBAUFKPBQXAEZQCJHSFTYYUYPXBVDRNUSOPXYFZPCATCQVLXNRRMPLKFJLAMDOHWCXTBCTQETKHKGTHUKYGZK']</script>

Test runner

Warning! For accurate results, please disable Firebug before running the tests. (Why?)

Java applet disabled.

Testing in unknown unknown
Test Ops/sec
Direct concatenation
 
var foo = 'a' + 'b' + 'c' + 'd';
 pending…
Individual += statements
 
var foo = 'a';
foo += 'b';
foo += 'c';
foo += 'd';
 pending…
Individual statements
 
var foo = 'a';
foo = foo + 'b';
foo = foo + 'c';
foo = foo + 'd';
 pending…
Using Array#join
 
var foo = arr.join('');
 pending…
Single individual statement
 
var foo = 'a';
foo += 'b' + 'c' + 'd';
 pending…
Function based (for)
 
function concat(arr) {
  len = arr.length;
  for (s = "", i = 0; i < len; s += arr[i], i++);
  return s;
}

var foo = concat(arr);
 pending…

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Revisions

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