Problema obespecheniya withoutopasnosti and strukturirovannogo management dannymi in srede Revit Server on protyazhenii mnogikh let ostavalas kriticheskoy uyazvimostyu for design organizations, ispolzuyuschikh tekhnologii informatsionnogo modelirovaniya (BIM). Standartnoe solution ot kompanii Autodesk, nesmotrya on svoyu effektivnost in chasti obespecheniya sovmestnoy raboty nad modelyami in lokalnykh setyakh and via globalnye podklyucheniya, iznachalno bylo lisheno razvitykh instrumentov administrirovaniya, granulyarnogo razgranicheniya prav access and glubokogo audita operatsiy. In etom kontekste poyavlenie system Revit Server Guard (RSG) oznamenovalo link ot stikhiynogo management servernoy infrastrukturoy k formalizovannoy, zaschischennoy and kontrolesruemoy modeli ekspluatatsii. Dannoe issledovanie predstavlyaet soboy detailed razbor functional capabilities RSG, analysis its polozheniya on globalnom rynke analogschnykh resheniy, a takzhe otsenku ekonomicheskikh parametrov vnedreniya and vladeniya sistemoy in usloviyakh sovremennykh trebovaniy k informatsionnoy withoutopasnosti.
Architectural and technical foundation of Revit Server Guard
solution RSG predstavlyaet soboy mnogokomponentnyy administrative module, sprojectirovannyy for raboty with versionsi Revit Server ot 2021 until 2027 years. Its architecture postroena on printsipe razdeleniya urovney predstavleniya, biznes-logiki and prinuditelnogo ispolneniya politik access. In otlichie ot poverkhnostnykh nadstroek, RSG vnedryaetsya neposredstvenno in kontur obmena dannymi mezhdu klientom Revit and serverom, chto allows ne prosto monitorit, no and aktivno upravlyat trafikom.
Tsentralnym uzlom system yavlyaetsya administrativnaya panel RSG Admin Panel, razworknnaya on baze sovremennykh veb-tekhnologiy React and Vite. This obespechivaet vysokuyu otzyvchivost interface, podderzhku krossbrauzernosti and vozmozhnost tsentralizovannogo management raspredelennoy servernoy infrastrukturoy from one tochki. Backend-chast system, RSG. API, funktsioniruet on platforme. NET 8 and razvertyvaetsya as sluzhba Windows, chto garantiruet vysokuyu proizvoditelnost and stabilnost, neobkhodimye for obrabotki zaprosov in rezhime realnogo vremeni.
For obespecheniya persistentnosti data and khraneniya konfiguratsiy sistema ispolzuet legkovesnye base data SQLite (rsg.db and rsg-proxy.db). Vybor etogo formata obuslovlen neobkhodimostyu minimizatsii nakladnykh raskhodov on administrirovanie SUBD, when etom obespechivaya dostatochnuyu skorost chteniya and zapisi for zadach audita and proverki prav. Klyuchevye komponenty system and ikh tekhnologicheskie roles predstavleny in sleduyuschey tablitse.
Komponent | Tekhnologicheskiy stek | Funktsionalnaya rol in sisteme |
|---|---|---|
RSG Admin Panel | React / Vite | Veb-interface administratora: navigatsiya, matritsy roley, otchetnost and lokalizatsiya. |
RSG.API | .NET 8 (Windows Service) | Obrabotka REST-zaprosov, avtorizatsiya, management bekapami and vzaimodeystvie with SQLite. |
RSG.Core | .NET 8 Class Library | Description biznes-suschnostey: users, projects, roles, sections and kontrakty litsenzirovaniya. |
RSG.Infrastructure | EF Core / SQLite | Realizatsiya servisov access k dannym, management bekapami and proksi-sluzhbami. |
RSG.HttpModule | Middleware | Check prav access on urovne HTTP-zaprosov k administrativnomu interfaceu Revit Server. |
RSG.NetTcpProxy | .NET Framework 4.8.1 | Perekhvat and filtratsiya WCF/net.tcp trafika, blokirovka nesanktsionirovannykh operatsiy zapisi/chteniya. |
Osobogo vnimaniya zasluzhivaet module RSG. NetTcpProxy. Poskolku Revit Server ispolzuet protokol net.tcp for synchronizatsii models, obychnye veb-filtry ne sposobny kontrolesrovat protsess obmena dannymi. Proksi-server RSG vystupaet in roles «prozrachnogo» shlyuza, which analysisiruet zagolovki SOAP-messages, izvlekaet identifikatory users and mashin, a then sopostavlyaet ikh with deystvuyuschey politikoy access in baze data. If operatsiya (naprimer, synchronizatsiya with tsentralnoy modelyu) ne razreshena for dannoy roles in konkretnom razdele projecta, proksi-server blokiruet peredachu data, predotvraschaya potentsialnuyu porchu or nesanktsionirovannoe izmenenie informatsii.
Analysis of analogs and the competitive environment in BIM administration
Rynok instrumentov for managing infrastrukturoy Revit mozhno razdelit on neskolko kategoriy: system glubokoy avtomatizatsii, oblachnye menedzhery projectov and spetsializirovannye alternativnye platformy. Provedennyy analysis pokazyvaet, chto RSG zanimaet unikalnuyu nishu, fokusiruyas imenno on withoutopasnosti and zaschite on-premise (lokalnykh) serverov.
Infrastructure automation: IMAGINiT Clarity
Naibolee zametnym igrokom on rynke yavlyaetsya IMAGINiT Clarity. This solution pozitsioniruetsya as moschnyy kombayn for avtomatizatsii zadach in Revit and Revit Server. Clarity orientirovan on povyshenie productivnosti via avtomaticheskiy eksport data, proverku zdorovya models and generatsiyu otchetov. In otlichie ot RSG, which delaet upor on razgranichenie prav access via proksirovanie trafika, Clarity in bolshey stepeni zanimaetsya «vtorichnoy» obrabotkoy data.
Soglasno tekhnicheskim opisaniyam, Clarity allows avtomatizirovat sozdanie PDF, DWG, Navisworks and IFC files, a takzhe provodit paketnuyu obrabotku Dynamo-skriptov. In chasti withoutopasnosti Clarity predlagaet module Security, no its work chasche total ogranichena managementm rightsmi on urovne papok and integratsiey with Active Directory, in to vremya as RSG predostavlyaet bolee granulyarnyy kontrol on urovne razdelov documentation (distsiplin) vnutri projecta.
Cloud management: Naviate (formerly BIMrx) Cloud Manager
Drugoy znachimyy analog — Naviate Cloud Manager (ranee izvestnyy as BIMrx Cloud Manager), razworknnyy kompaniey Microdesk (nyne chast Symetri). This product natselen on management sredoy Autodesk Construction Cloud (ACC) and BIM 360. Its osnovnye functions vklyuchayut uskorennuyu nastroyku projectov, management uchastnikami and avtomatizatsiyu zagruzki/vygruzki data.
Analysis funktsionala Naviate Cloud Manager pokazyvaet, chto on reshaet zadachi, skhozhie with RSG, no in oblachnom konture. Naprimer, on obespechivaet soblyudenie withoutopasnosti administrirovaniya when sozdanii projectov and upravlenii useryami, ogranichivaya access on osnove urovney Account Admin and Project Admin. Odnako for organizations, which obyazany khranit dannye on sobstvennykh serverakh in silu trebovaniy zakonodatelstva or korporativnykh standartov, oblachnye menedzhery ne mogut sluzhit pryamoy zamenoy RSG.
Specialized alternatives and SaaS solution
On rossiyskom rynke takzhe prisutstvuet servis RSNBIM, which predlagaet Revit Server as oblachnuyu uslugu (SaaS). RSNBIM predostavlyaet gotovuyu veb-panel for managing useryami and projectami, a takzhe vklyuchaet plugins for monitoringa aktivnosti projectirovschikov. This solution izbavlyaet ot neobkhodimosti podderzhki sobstvennogo oborudovaniya, no, as and in sluchae with ACC, perenosit dannye vo vneshnyuyu sredu.
In sleduyuschey tablitse predstavleno sravnitelnoe pozitsionirovanie RSG otnositelno klyuchevykh analogs by funktsionalnym vozmozhnostyam.
Kharakteristika | Revit Server Guard (RSG) | IMAGINiT Clarity | Naviate Cloud Manager | RSNBIM |
|---|---|---|---|---|
Osnovnaya sreda | Lokalnyy Revit Server | Gibridnaya (RS + Cloud) | Oblako (ACC / BIM 360) | Oblachnyy Revit Server |
Metod zaschity | Net.tcp Proxy (Enforcement) | Monitoring and rights access | Rolevaya model API Cloud | VPN and rights access |
Kontrol distsiplin | Da (Sectional Access) | Ogranichenno (Folder-based) | Net (only uroven papok) | Ogranichenno (rights projecta) |
Automation zadach | Bekapy and inventarizatsiya | Eksport, otchety, Dynamo | Publikatsiya, synchronizatsiya | Treking vremeni, otchety |
Tip litsenzirovaniya | Godovaya subscription | Zaprosnaya cost | Pouserskaya | Tarifnye plany (Start/Pro) |
Economic parameters: pricing and distribution terms
Opredelenie costi vladeniya sistemoy RSG trebuet analysisa as pryamykh zatrat on litsenzirovanie, tak and kosvennykh vygod ot snizheniya riskov. Soglasno rynochnym dannym, RSG rasprostranyaetsya by modeli godovykh or trekhletnikh podpisok, chto yavlyaetsya standartom for sovremennogo inzhenernogo By.
Cost licenses and struktura zatrat
On osnove accessnoy informatsii o pricekh on spetsializirovannoe BIM-soprovozhdenie, mozhno vydelit sleduyuschie tsenovye category for RSG.
Variant litsenzirovaniya | Srok deystviya | Orientirovochnaya cost (rub.) |
|---|---|---|
Odnouserskaya license (pervichnaya) | 1 year | 119 712,01 |
Odnouserskaya license (pervichnaya) | 3 years | 341 201,65 |
Prodlenie license | 1 year | 108 503,02 |
Prodlenie license | 3 years | 309 368,12 |
Prodlenie setevoy license | 1 year | 148 407,02 |
For sravneniya, bazovaya subscription on sam Autodesk Revit obkhoditsya organizatsii approximately in $3,005 in year (okolo 290,000–300,000 rub.). Takim obrazom, cost vnedreniya upravlyayuschego kontura RSG sostavlyaet approximately 40% ot costi one license Revit, no when etom RSG zaschischaet dannye vsey projectnoy komandy, workyuschey on servere. This ukazyvaet on vysokuyu ekonomicheskuyu effektivnost solution when masshtabirovanii on krupnye otdely.
Distribution and delivery terms
Product postavlyaetsya in elektronnom vide, chto minimiziruet logisticheskie izderzhki and sokraschaet vremya vvoda in ekspluatatsiyu. Tipichnyy srok komplektatsii zakaza sostavlyaet 2–3 rabochikh dnya. Programmnoe obespechenie podderzhivaet interface on russkom and angliyskom yazykakh, chto rasshiryaet capabilities its primeneniya in mezhdunarodnykh projectnykh konsortsiumakh.
Litsenzirovanie RSG tesno svyazano with funktsionalom admin-paneli. In razdele konfiguratsii predusmotreny instrumenty for activation, prodleniya and monitoringa status license. Sistema otslezhivaet kolichestvo aktivnykh users and versiy Revit Server, on which rasprostranyaetsya zaschita. Vazhno otmetit, chto solution podderzhivaet multiversionnost: one installyatsiya RSG mozhet odnovremenno obsluzhivat projects, sozdannye in raznykh versiyakh Revit (with 2021 by 2027), chto isklyuchaet neobkhodimost pokupki otdelnykh licenses pod kazhduyu versiyu server.
Detailed analysis of functional modulees and the user interface
Effektivnost RSG as instrumenta administrirovaniya vo mnogom opredelyaetsya kachestvom prorabotki user interface and logiki management dannymi. Sistema vklyuchaet 10 klyuchevykh functional oblastey, each from kotorykh reshaet spetsificheskie zadachi BIM-menedzhmenta.
Global monitoring and consolidated access analytics
Page «overview» predstavlyaet soboy tsentralnyy pult management, gde akkumuliruetsya informatsiya o svyazyakh mezhdu useryami, projectami and rolyami. Integratsiya PivotTable (svodnoy tablitsy) and PivotTree (dereva) allows administratoru mgnovenno pereklyuchatsya mezhdu razlichnymi predstavleniyami data: ot ploskogo spiska naznacheniy until ierarkhicheskoy struktury organizatsii.
Ispolzovanie kontekstov lokalizatsii (I18nContext) and stranovykh circuits (CountryScopeContext) in interfacee ukazyvaet on glubokuyu arkhitekturnuyu prorabotku product for nuzhd krupnykh kholdingov. This allows filtrovat roles and sections in zavisimosti ot regionalnykh standartov projectirovaniya, ne sozdavaya when etom razroznennykh baz data. Takoy podkhod minimiziruet kognitivnuyu nagruzku on administratora and snizhaet risk oshibochnogo naznacheniya prav in slozhnykh, mnogourovnevykh projectakh.
Reestr identichnostey and management useryami
module «Users» in RSG vykhodit za ramki prostogo spiska imen. Sistema implements kontseptsiyu «doverennoy privyazki», svyazyvaya login userya with konkretnoy mashinoy (Computer Name) and IP-adresom. This kriticheski vazhnyy uroven zaschity, predotvraschayuschiy access k serveru by ukradennym uchetnym dannym with neavtorizovannykh ustroystv.
In interfacee predusmotreny kartochki statistiki, which naglyadno demonstriruyut uroven potrebleniya licenses and aktivnost uchetnykh zapisey. Vozmozhnost importa and eksporta base users in formate JSON/Excel oblegchaet migratsiyu data and integratsiyu with vneshnimi HR-sistemami organizatsii. Nalichie istorii podklyucheniy allows provodit operativnye rassledovaniya in sluchae vozniknoveniya tekhnicheskikh konfliktov or intsidentov withoutopasnosti.
Management projectami and distsiplinarnoe razdelenie
Section «projects» obespechivaet synchronizatsiyu lokalnoy base RSG with fakticheskim soderzhimym Revit Server. One from naibolee znachimykh funktsiy zdes yavlyaetsya mekhanizm SectionFolderBinding — svyazyvanie papok projecta with razdelami projectnoy documentation (naprimer, AR, KR, IOS).
In traditsionnom Revit Server rights vydayutsya on project tselikom. RSG lomaet etu paradigmu, pozvolyaya BIM-menedzheru naznachit, naprimer, spetsialistu by ventilyatsii rights on zapis only in papku «03_OV», when etom ostavlyaya ostalnye chasti projecta accessnymi only for chteniya or polnostyu skrytymi. This ne only povyshaet security, no and distsipliniruet protsess projectirovaniya, isklyuchaya sluchaynye changes in smezhnykh razdelakh.
Rolevaya model and matritsa polnomochiy
Matritsa roley in RSG yavlyaetsya instrumentom tonkoy settings access. Each rol predstavlyaet soboy nabor razresheniy on vypolnenie operatsiy chteniya or zapisi in razreze konkretnykh distsiplin. Interface matritsy allows vizualno otsenit uroven access: by strokam raspolagayutsya roles, by stolbtsam — sections.
Sistema podderzhivaet vstroennye roles (naprimer, Administrator, Project Admin), which obespechivayut bazovoe funktsionirovanie, and allows sozdavat neogranichennoe kolichestvo userskikh roley. Funktsiya kopirovaniya roley uskoryaet protsess masshtabirovaniya prav when poyavlenii novykh tipov uchastnikov projecta. Pered sokhraneniem izmeneniy sistema rasschityvaet «Impact» — kolichestvo users and projectov, on kotorykh otrazyatsya changes, chto sluzhit vazhnym predokhranitelem ot massovykh sboev access.
Tekhnicheskaya ekspluatatsiya: Shlyuzy, proksi and setevaya security
Kriticheskim elementom RSG, obespechivayuschim fakticheskoe ispolnenie prav access, yavlyaetsya sistema proksi-shlyuzov. Without etogo sloya lyubaya panel management ostaetsya lish sredstvom vizualizatsii, ne sposobnym realno ostanovit nesanktsionirovannyy request.
Konfiguratsiya network circuits and portov
Pravilnaya configuration portov — zalog stabilnoy raboty RSG. Sistema trebuet chetkogo razdeleniya trafika on administrative, userskiy and sluzhebnyy.
Kontur | Port by umolchaniyu | Naznachenie and accessnost |
|---|---|---|
RSG Admin Panel | TCP 5080 | access only for BIM-administratorov. Management vsey sistemoy. |
Proxy Public (Listen) | TCP 808 | Tochka sign ina for vsekh Revit-klientov. Dolzhna byt opena in seti organizatsii. |
Revit Server (Target) | TCP 8086 | Vnutrenniy port RS. Dolzhen byt close for users and accessen only for proksi. |
Admin REST Service | TCP 80 | Ispolzuetsya proksi-serverom for diagnostiki and polucheniya struktury katalogov. |
When takoy skheme user in configurationkh Revit ukazyvaet address proksi-server and port 808. Proksi-server prinimaet request, proveryaet its via Decision API and, in sluchae odobreniya, peresylaet on port 8086 realnogo Revit Server. This sozdaet fizicheskiy barer, which nevozmozhno oboyti, ne imeya pryamogo access k serveru on urovne administratora OS.
Diagnostika and zhivuchest system
Interface «Shlyuzy RS» predostavlyaet instrumenty for monitoringa sostoyaniya proksi-protsessov. Funktsiya «Detekt» allows verify dostizhimost vsekh neobkhodimykh endpointov Revit Server pered vklyucheniem rezhima zaschity. In sistemu vstroen mekhanizm logirovaniya trafika proksi, which in realnom vremeni otobrazhaet popytki access neizvestnykh users or otkazy in avtorizatsii.
Vazhnym aspektom yavlyaetsya work proksi in rezhime «Bypass» (obkhod). If license ne pokryvaet opredelennuyu versiyu Revit Server or voznikli tekhnicheskie problemy with bazoy data prav, proksi mozhet perekhodit in rezhim propuska trafika without filtratsii, chtoby ne paralizovat rabotu vsey organizatsii. Odnako this rezhim detalno logiruetsya, and administrator poluchaet uvedomlenie o snizhenii urovnya zaschity.
Obsluzhivanie infrastruktury: Bekapy, audit and analytics
Pomimo funktsiy zaschity, RSG beret on sebya zadachi by podderzhaniyu tselostnosti data and analysisu effektivnosti rabochikh protsessov.
Rezervnoe kopirovanie projectov
module «Bekapy» in RSG avtomatiziruet protsess sozdaniya arkhivnykh kopiy models. In otlichie ot standartnykh sredstv kopirovaniya files, RSG ponimaet strukturu projectov Revit Server.
- Gibkost raspisaniya: For kazhdogo projecta mozhno zadat individualnyy grafik (naprimer, ezhednevnoe kopirovanie in 2:00).
- Inkrementalnost: Support inkrementalnogo kopirovaniya allows znachitelno ekonomit mesto on servere, sokhranyaya only izmenennye chasti models.
- Status and history: Panel monitoringa pokazyvaet uspeshnost poslednikh launchov, chto allows vovremya zametit problemy with diskovym prostranstvom or accessom k setevym khranilischam.
Glubokiy audit and Live-monitoring
Zhurnal audita in RSG yavlyaetsya «chernym yaschikom» system. In nem fiksiruetsya kazhdoe znachimoe sobytie: sozdanie projecta, izmenenie roles userya, uspeshnaya or zablokirovannaya popytka synchronizatsii.
- Live-potok: Administrator mozhet nablyudat za activity on servere in rezhime realnogo vremeni. This bestsennyy tool when otladke problem with accessom.
- Eksport otchetov: Sistema allows vygruzhat dannye audita in formaty PDF and XLSX for predostavleniya otchetov sluzhbam withoutopasnosti or rukovodstvu kompanii.
- Analytics deystviy: Kolonki «Tip obekta» and «Detali» pozvolyayut bystro otfiltrovat, naprimer, all sluchai udaleniya models or changes prav administratora.
Statistika and prinyatie resheniy on osnove data
module statistiki predostavlyaet vizualizatsiyu aktivnosti in srede BIM. Grafiki raspredeleniya deystviy by projectam and rolyam pomogayut ponyat, kakie obekty nakhodyatsya in active faze, a kakie — in zastoe.
- Lidery aktivnosti: Spiski samykh aktivnykh users pozvolyayut vyyavlyat peregruzhennykh sotrudnikov or, naoborot, tekh, kto ignoriruet rabotu in tsentralnoy modeli.
- Eksport for BIM-menedzherov: Spetsializirovannye otchety by aktivnosti models specific projecta pomogayut analysisirovat chastotu synchronizatsiy and vyyavlyat potentsialnye riski «razduvaniya» files models.
Comparison ekonomicheskikh models vladeniya: RSG vs Oblachnye solution
Vybor mezhdu RSG (on baze lokalnogo Revit Server) and oblachnymi resheniyami tipa Autodesk Construction Cloud (ACC) chasto svoditsya k voprosu sovokupnoy costi vladeniya (TCO).
Parametr | Model on baze RSG (On-premise) | Oblachnaya model (ACC / BIM Collaborate Pro) |
|---|---|---|
Cost licenses | Fiksirovannaya za server module (~120k rub./year). | Pouserskaya (~80-100k rub./year on kazhdogo yuzera). |
Infrastruktura | Svoi servery, zatraty on elektrichestvo and IT-personal. | Vklyucheno in cost podpiski. |
Kontrol data | Polnyy fizicheskiy kontrol, sootvetstvie IB. | Dannye on serverakh vendora (SShA/Evropa). |
Masshtabiruemost | Ogranichena moschnostyu oborudovaniya. | Prakticheski neogranichena. |
For projectnoy organizatsii so shtatom in 50 projectirovschikov:
- Oblako (ACC): 50 users * 90,000 rub. = 4,500,000 rub. in year.
- Locally (RS + RSG): license RSG 120,000 rub. + amortizatsiya server + FOT IT-administratora (uslovno 1,000,000 rub.) = ~1,120,000 rub. in year.
Ekonomicheskiy analysis podtverzhdaet, chto for srednikh and krupnykh kompaniy RSG yavlyaetsya moschnym rychagom optimizatsii byudzheta, pozvolyaya sokhranyat vysokie standarty withoutopasnosti when kratno menshikh zatratakh on By. When etom RSG ustranyaet glavnyy nedostatok lokalnogo Revit Server — otsutstvie kontrolya access, — delaya its funktsionalno sopostavimym with dorogimi cloud platforms.
Strategicheskiy vzglyad on razvitie and vnedrenie system
Vnedrenie Revit Server Guard in IT-landshaft projectnoy organizatsii — this ne prosto installation programmy, a protsess formalizatsii pravil raboty. On osnove documentation mozhno vydelit etapy zrelosti system in kompanii.
- Inventarizatsiya and normalizatsiya: On pervom etape RSG ispolzuetsya for navedeniya poryadka in katalogakh Revit Server. Obnovlenie katalogov and import projectov pozvolyayut uvidet realnuyu kartinu zagruzki serverov.
- Zaschita and razgranichenie: On vtorom etape vnedryaetsya rolevaya model. Svyazyvanie papok with razdelami documentation (SectionFolderBinding) allows zakrepit otvetstvennost za konkretnymi ispolnitelyami. launch proksi-server perevodit sistemu in rezhim active zaschity.
- Analytics and optimizatsiya: On tretem etape dannye audita and statistiki ispolzuyutsya for optimizatsii protsessov. Rukovodstvo poluchaet dokazatelnuyu bazu for prinyatiya resheniy o rasshirenii shtata or modernizatsii servernogo oborudovaniya.
Tekhnicheskaya support multiversionnosti (with 2021 by 2027 year) garantiruet, chto investitsii in RSG zaschischeny ot chastykh obnovleniy productov Autodesk. This osobenno vazhno in usloviyakh, kogda raznye zakazchiki trebuyut vypolneniya rabot in raznykh versiyakh Revit, and organizatsiya vynuzhdena podderzhivat slozhnyy zoopark serverov.
Podvodya itog, mozhno utverzhdat, chto Revit Server Guard yavlyaetsya neobkhodimym zvenom in evolyutsii projectnykh byuro, workyuschikh by tekhnologii BIM. On prevraschaet «chernyy yaschik» Revit Server in prozrachnuyu, upravlyaemuyu and withoutopasnuyu sredu, predostavlyaya administratoram instrumenty kontrolya, a rukovodstvu — uverennost in sokhrannosti intellektualnoy sobstvennosti kompanii. In sravnenii with mirovymi analogami, RSG vydelyaetsya svoey spetsializatsiey on zaschite setevogo trafika and glubokoy integratsiey in spetsifiku otechestvennogo projectirovaniya (razdelenie by distsiplinam/razdelam), ostavayas when etom konkurentosposobnym by tsene and usloviyam ekspluatatsii.
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