return {
 ["aleph"]={
  "Alephminorversion",
  "Alephrevision",
  "Alephversion",
 },
 ["etex"]={
  "botmarks",
  "clubpenalties",
  "currentgrouplevel",
  "currentgrouptype",
  "currentifbranch",
  "currentiflevel",
  "currentiftype",
  "detokenize",
  "dimexpr",
  "displaywidowpenalties",
  "everyeof",
  "firstmarks",
  "fontchardp",
  "fontcharht",
  "fontcharic",
  "fontcharwd",
  "glueexpr",
  "glueshrink",
  "glueshrinkorder",
  "gluestretch",
  "gluestretchorder",
  "gluetomu",
  "ifcsname",
  "ifdefined",
  "iffontchar",
  "interactionmode",
  "interlinepenalties",
  "lastlinefit",
  "lastnodetype",
  "marks",
  "muexpr",
  "mutoglue",
  "numexpr",
  "pagediscards",
  "parshapedimen",
  "parshapeindent",
  "parshapelength",
  "protected",
  "savinghyphcodes",
  "savingvdiscards",
  "scantokens",
  "showgroups",
  "showifs",
  "showtokens",
  "splitbotmarks",
  "splitdiscards",
  "splitfirstmarks",
  "topmarks",
  "tracingassigns",
  "tracinggroups",
  "tracingifs",
  "tracingnesting",
  "unexpanded",
  "unless",
  "widowpenalties",
 },
 ["luatex"]={
  "Uabove",
  "Uabovewithdelims",
  "Uatop",
  "Uatopwithdelims",
  "Udelcode",
  "Udelimited",
  "Udelimiter",
  "Udelimiterover",
  "Udelimiterunder",
  "Uhextensible",
  "Uleft",
  "Umathaccent",
  "Umathaccentbasedepth",
  "Umathaccentbaseheight",
  "Umathaccentbottomovershoot",
  "Umathaccentbottomshiftdown",
  "Umathaccentextendmargin",
  "Umathaccentsuperscriptdrop",
  "Umathaccentsuperscriptpercent",
  "Umathaccenttopovershoot",
  "Umathaccenttopshiftup",
  "Umathaccentvariant",
  "Umathadapttoleft",
  "Umathadapttoright",
  "Umathaxis",
  "Umathbottomaccentvariant",
  "Umathchar",
  "Umathchardef",
  "Umathcode",
  "Umathconnectoroverlapmin",
  "Umathdegreevariant",
  "Umathdelimiterextendmargin",
  "Umathdelimiterovervariant",
  "Umathdelimiterpercent",
  "Umathdelimitershortfall",
  "Umathdelimiterundervariant",
  "Umathdenominatorvariant",
  "Umathdictdef",
  "Umathexheight",
  "Umathextrasubpreshift",
  "Umathextrasubprespace",
  "Umathextrasubshift",
  "Umathextrasubspace",
  "Umathextrasuppreshift",
  "Umathextrasupprespace",
  "Umathextrasupshift",
  "Umathextrasupspace",
  "Umathflattenedaccentbasedepth",
  "Umathflattenedaccentbaseheight",
  "Umathflattenedaccentbottomshiftdown",
  "Umathflattenedaccenttopshiftup",
  "Umathfractiondelsize",
  "Umathfractiondenomdown",
  "Umathfractiondenomvgap",
  "Umathfractionnumup",
  "Umathfractionnumvgap",
  "Umathfractionrule",
  "Umathfractionvariant",
  "Umathhextensiblevariant",
  "Umathlimitabovebgap",
  "Umathlimitabovekern",
  "Umathlimitabovevgap",
  "Umathlimitbelowbgap",
  "Umathlimitbelowkern",
  "Umathlimitbelowvgap",
  "Umathlimits",
  "Umathnoaxis",
  "Umathnolimits",
  "Umathnolimitsubfactor",
  "Umathnolimitsupfactor",
  "Umathnumeratorvariant",
  "Umathopenupdepth",
  "Umathopenupheight",
  "Umathoperatorsize",
  "Umathoverbarkern",
  "Umathoverbarrule",
  "Umathoverbarvgap",
  "Umathoverdelimiterbgap",
  "Umathoverdelimitervariant",
  "Umathoverdelimitervgap",
  "Umathoverlayaccentvariant",
  "Umathoverlinevariant",
  "Umathphantom",
  "Umathprimeraise",
  "Umathprimeraisecomposed",
  "Umathprimeshiftdrop",
  "Umathprimeshiftup",
  "Umathprimespaceafter",
  "Umathprimevariant",
  "Umathquad",
  "Umathradicaldegreeafter",
  "Umathradicaldegreebefore",
  "Umathradicaldegreeraise",
  "Umathradicalextensibleafter",
  "Umathradicalextensiblebefore",
  "Umathradicalkern",
  "Umathradicalrule",
  "Umathradicalvariant",
  "Umathradicalvgap",
  "Umathruledepth",
  "Umathruleheight",
  "Umathskeweddelimitertolerance",
  "Umathskewedfractionhgap",
  "Umathskewedfractionvgap",
  "Umathsource",
  "Umathspaceafterscript",
  "Umathspacebeforescript",
  "Umathspacebetweenscript",
  "Umathstackdenomdown",
  "Umathstacknumup",
  "Umathstackvariant",
  "Umathstackvgap",
  "Umathsubscriptsnap",
  "Umathsubscriptvariant",
  "Umathsubshiftdown",
  "Umathsubshiftdrop",
  "Umathsubsupshiftdown",
  "Umathsubsupvgap",
  "Umathsubtopmax",
  "Umathsupbottommin",
  "Umathsuperscriptsnap",
  "Umathsuperscriptvariant",
  "Umathsupshiftdrop",
  "Umathsupshiftup",
  "Umathsupsubbottommax",
  "Umathtopaccentvariant",
  "Umathunderbarkern",
  "Umathunderbarrule",
  "Umathunderbarvgap",
  "Umathunderdelimiterbgap",
  "Umathunderdelimitervariant",
  "Umathunderdelimitervgap",
  "Umathunderlinevariant",
  "Umathuseaxis",
  "Umathvextensiblevariant",
  "Umathvoid",
  "Umathxscale",
  "Umathyscale",
  "Umiddle",
  "Uoperator",
  "Uover",
  "Uoverdelimiter",
  "Uoverwithdelims",
  "Uradical",
  "Uright",
  "Uroot",
  "Urooted",
  "Uskewed",
  "Uskewedwithdelims",
  "Ustartdisplaymath",
  "Ustartmath",
  "Ustartmathmode",
  "Ustopdisplaymath",
  "Ustopmath",
  "Ustopmathmode",
  "Ustretched",
  "Ustretchedwithdelims",
  "Uunderdelimiter",
  "Uvextensible",
  "additionalpageskip",
  "adjacentdemerits",
  "adjustspacing",
  "adjustspacingshrink",
  "adjustspacingstep",
  "adjustspacingstretch",
  "advanceby",
  "afterassigned",
  "aftergrouped",
  "aliased",
  "aligncontent",
  "alignloop",
  "alignmark",
  "alignmentcellsource",
  "alignmentwrapsource",
  "alignoption",
  "alignsnapping",
  "aligntab",
  "allcrampedstyles",
  "alldisplaystyles",
  "allmainstyles",
  "allmathstyles",
  "allscriptscriptstyles",
  "allscriptstyles",
  "allsplitstyles",
  "alltextstyles",
  "alluncrampedstyles",
  "allunsplitstyles",
  "amcode",
  "associateunit",
  "atendoffile",
  "atendoffiled",
  "atendofgroup",
  "atendofgrouped",
  "attribute",
  "attributeboundary",
  "attributedef",
  "automaticdiscretionary",
  "automatichyphenpenalty",
  "automigrationmode",
  "autoparagraphmode",
  "balanceadjdemerits",
  "balancebottomskip",
  "balanceboundary",
  "balancebreakpasses",
  "balancechecks",
  "balanceemergencyshrink",
  "balanceemergencystretch",
  "balancefinalpenalties",
  "balancelineheight",
  "balancelooseness",
  "balancepasses",
  "balancepenalty",
  "balanceshape",
  "balanceshapebottomspace",
  "balanceshapetopspace",
  "balanceshapevsize",
  "balancetolerance",
  "balancetopskip",
  "balancevsize",
  "begincsname",
  "beginlocalcontrol",
  "beginmathgroup",
  "beginmvl",
  "beginsimplegroup",
  "bottomskip",
  "boundary",
  "boxadapt",
  "boxanchor",
  "boxanchors",
  "boxattribute",
  "boxdirection",
  "boxfinalize",
  "boxfreeze",
  "boxgeometry",
  "boxinserts",
  "boxlimit",
  "boxlimitate",
  "boxlimitmode",
  "boxmigrate",
  "boxorientation",
  "boxrepack",
  "boxshift",
  "boxshrink",
  "boxsnapping",
  "boxsource",
  "boxstretch",
  "boxsubtype",
  "boxtarget",
  "boxtotal",
  "boxvadjust",
  "boxxmove",
  "boxxoffset",
  "boxymove",
  "boxyoffset",
  "breaklasthangindent",
  "breaklasthangleftindent",
  "breaklasthangleftslack",
  "breaklasthangrightindent",
  "breaklasthangrightslack",
  "breaklasthangslack",
  "breaklastlinecount",
  "breaklastlinewidth",
  "brokenpenalties",
  "catcodetable",
  "cccode",
  "cdef",
  "cdefcsname",
  "cfcode",
  "clearmarks",
  "constant",
  "constrained",
  "copymathatomrule",
  "copymathparent",
  "copymathspacing",
  "copysplitdiscards",
  "crampeddisplaystyle",
  "crampedscriptscriptstyle",
  "crampedscriptstyle",
  "crampedtextstyle",
  "csactive",
  "csnamestring",
  "csstring",
  "currentalignmentcolumn",
  "currentalignmentrow",
  "currentalignmenttabskip",
  "currentloopiterator",
  "currentloopnesting",
  "currentlysetmathstyle",
  "currentmarks",
  "currentstacksize",
  "dbox",
  "defcsname",
  "deferred",
  "detokened",
  "detokenized",
  "dimensiondef",
  "dimexperimental",
  "dimexpression",
  "directlua",
  "discretionaryoptions",
  "divideby",
  "doublepenaltymode",
  "dpack",
  "dsplit",
  "edefcsname",
  "edivide",
  "edivideby",
  "efcode",
  "emergencyleftskip",
  "emergencyrightskip",
  "emptyparagraphmode",
  "endlocalcontrol",
  "endmathgroup",
  "endmvl",
  "endsimplegroup",
  "enforced",
  "eofinput",
  "errorrecoverymode",
  "etexexprmode",
  "etoks",
  "etoksapp",
  "etokspre",
  "eufactor",
  "everybeforepar",
  "everymathatom",
  "everyparbegin",
  "everyparend",
  "everytab",
  "exapostrophechar",
  "exceptionpenalty",
  "expand",
  "expandactive",
  "expandafterpars",
  "expandafterspaces",
  "expandcstoken",
  "expanded",
  "expandedafter",
  "expandeddetokenize",
  "expandedendless",
  "expandedloop",
  "expandedrepeat",
  "expandparameter",
  "expandtoken",
  "expandtoks",
  "explicitdiscretionary",
  "explicithyphenpenalty",
  "explicititaliccorrection",
  "explicitspace",
  "firstvalidlanguage",
  "fitnessclasses",
  "float",
  "floatdef",
  "floatexpr",
  "flushmarks",
  "flushmvl",
  "fontcharba",
  "fontcharlb",
  "fontcharlt",
  "fontcharrb",
  "fontcharrt",
  "fontcharta",
  "fontid",
  "fontidentifier",
  "fontmathcontrol",
  "fontspecdef",
  "fontspecid",
  "fontspecifiedname",
  "fontspecifiedsize",
  "fontspecscale",
  "fontspecslant",
  "fontspecweight",
  "fontspecxscale",
  "fontspecyscale",
  "fonttextcontrol",
  "forcedleftcorrection",
  "forcedrightcorrection",
  "formatname",
  "frozen",
  "futurecsname",
  "futuredef",
  "futureexpand",
  "futureexpandis",
  "futureexpandisap",
  "gdefcsname",
  "givenmathstyle",
  "gleaders",
  "glet",
  "gletcsname",
  "glettonothing",
  "gluespecdef",
  "glyph",
  "glyphdatafield",
  "glyphoptions",
  "glyphscale",
  "glyphscriptfield",
  "glyphscriptscale",
  "glyphscriptscriptscale",
  "glyphslant",
  "glyphstatefield",
  "glyphtextscale",
  "glyphweight",
  "glyphxoffset",
  "glyphxscale",
  "glyphxscaled",
  "glyphyoffset",
  "glyphyscale",
  "glyphyscaled",
  "gtoksapp",
  "gtokspre",
  "hbadnessmode",
  "hccode",
  "hjcode",
  "hmcode",
  "holdingmigrations",
  "hpack",
  "hpenalty",
  "hyphenationmin",
  "hyphenationmode",
  "ifabsdim",
  "ifabsfloat",
  "ifabsnum",
  "ifarguments",
  "ifboolean",
  "ifchkdim",
  "ifchkdimension",
  "ifchkdimexpr",
  "ifchknum",
  "ifchknumber",
  "ifchknumexpr",
  "ifcmpdim",
  "ifcmpnum",
  "ifcondition",
  "ifcramped",
  "ifcstok",
  "ifdimexpression",
  "ifdimval",
  "ifempty",
  "ifflags",
  "iffloat",
  "ifhaschar",
  "ifhastok",
  "ifhastoks",
  "ifhasxtoks",
  "ifinalignment",
  "ifincsname",
  "ifinsert",
  "ifintervaldim",
  "ifintervalfloat",
  "ifintervalnum",
  "iflastnamedcs",
  "iflist",
  "ifmathparameter",
  "ifmathstyle",
  "ifnumexpression",
  "ifnumval",
  "ifparameter",
  "ifparameters",
  "ifrelax",
  "ifspecification",
  "iftok",
  "ifzerodim",
  "ifzerofloat",
  "ifzeronum",
  "ignorearguments",
  "ignoredepthcriterion",
  "ignorenestedupto",
  "ignorepars",
  "ignorerest",
  "ignoretokens",
  "ignoreupto",
  "immediate",
  "immutable",
  "indexedsubprescript",
  "indexedsubscript",
  "indexedsuperprescript",
  "indexedsuperscript",
  "indexofcharacter",
  "indexofregister",
  "inherited",
  "initcatcodetable",
  "initialpageskip",
  "initialtopskip",
  "insertboundary",
  "insertbox",
  "insertcategory",
  "insertcopy",
  "insertdepth",
  "insertdirection",
  "insertdistance",
  "insertheight",
  "insertheights",
  "insertlimit",
  "insertlinedepth",
  "insertlineheight",
  "insertmaxdepth",
  "insertmaxplaced",
  "insertmode",
  "insertmultiplier",
  "insertonlycount",
  "insertoptions",
  "insertpenalty",
  "insertplaced",
  "insertprogress",
  "insertshrink",
  "insertstorage",
  "insertstoring",
  "insertstretch",
  "insertunbox",
  "insertuncopy",
  "insertwidth",
  "instance",
  "integerdef",
  "justificationskip",
  "lastalignmentcolumn",
  "lastalignmentrow",
  "lastarguments",
  "lastatomclass",
  "lastboundary",
  "lastchkdimension",
  "lastchknumber",
  "lastleftclass",
  "lastloopiterator",
  "lastnamedcs",
  "lastnodesubtype",
  "lastpageextra",
  "lastparcontext",
  "lastpartrigger",
  "lastrightclass",
  "leftmarginkern",
  "lefttwindemerits",
  "letcharcode",
  "letcsname",
  "letfrozen",
  "letmathatomrule",
  "letmathparent",
  "letmathspacing",
  "letprotected",
  "lettolastnamedcs",
  "lettonothing",
  "linebreakchecks",
  "linebreakoptional",
  "linebreakpasses",
  "linedirection",
  "linesnapping",
  "linesnappingdpfactor",
  "linesnappinghtfactor",
  "linesnappingtolerance",
  "localbreakpar",
  "localbrokenpenalty",
  "localcontrol",
  "localcontrolled",
  "localcontrolledendless",
  "localcontrolledloop",
  "localcontrolledrepeat",
  "localhangafter",
  "localhangindent",
  "localinterlinepenalty",
  "localleftbox",
  "localleftboxbox",
  "localmiddlebox",
  "localmiddleboxbox",
  "localpretolerance",
  "localrightbox",
  "localrightboxbox",
  "localtolerance",
  "lpcode",
  "luaboundary",
  "luabytecode",
  "luabytecodecall",
  "luacopyinputnodes",
  "luadef",
  "luaescapestring",
  "luafunction",
  "luafunctioncall",
  "luametatexmajorversion",
  "luametatexminorversion",
  "luametatexrelease",
  "luatexbanner",
  "luatexrevision",
  "luatexversion",
  "mathatom",
  "mathatomglue",
  "mathatomskip",
  "mathbackwardpenalties",
  "mathbeginclass",
  "mathboundary",
  "mathcharclass",
  "mathcharfam",
  "mathcharslot",
  "mathcheckfencesmode",
  "mathclass",
  "mathdictgroup",
  "mathdictionary",
  "mathdictproperties",
  "mathdirection",
  "mathdiscretionary",
  "mathdisplaymode",
  "mathdisplaypenaltyfactor",
  "mathdisplayskipmode",
  "mathdoublescriptmode",
  "mathendclass",
  "matheqnogapstep",
  "mathfontcontrol",
  "mathforwardpenalties",
  "mathgluemode",
  "mathgroupingmode",
  "mathinlinepenaltyfactor",
  "mathleftclass",
  "mathlimitsmode",
  "mathmainstyle",
  "mathoptions",
  "mathparentstyle",
  "mathpenaltiesmode",
  "mathpretolerance",
  "mathrightclass",
  "mathrulesfam",
  "mathrulesmode",
  "mathscale",
  "mathscriptsmode",
  "mathslackmode",
  "mathsnapping",
  "mathspacingmode",
  "mathstack",
  "mathstackstyle",
  "mathstyle",
  "mathstylefontid",
  "mathsurroundmode",
  "mathsurroundskip",
  "maththreshold",
  "mathtolerance",
  "meaningasis",
  "meaningful",
  "meaningfull",
  "meaningles",
  "meaningless",
  "mugluespecdef",
  "multiplyby",
  "mutable",
  "mvlcurrentlyactive",
  "nestedloopiterator",
  "noaligned",
  "noarguments",
  "noatomruling",
  "noboundary",
  "nohrule",
  "nomathchar",
  "nooutputboxerror",
  "norelax",
  "normalizelinemode",
  "normalizeparmode",
  "noscript",
  "nospaces",
  "nosubprescript",
  "nosubscript",
  "nosuperprescript",
  "nosuperscript",
  "notexpanded",
  "novrule",
  "numericscale",
  "numericscaled",
  "numexperimental",
  "numexpression",
  "optionalboundary",
  "optionspar",
  "orelse",
  "orphanlinefactors",
  "orphanpenalties",
  "orunless",
  "outputbox",
  "overloaded",
  "overloadmode",
  "overshoot",
  "pageboundary",
  "pageexcess",
  "pageextragoal",
  "pagefistretch",
  "pagelastdepth",
  "pagelastfilllstretch",
  "pagelastfillstretch",
  "pagelastfilstretch",
  "pagelastfistretch",
  "pagelastheight",
  "pagelastshrink",
  "pagelaststretch",
  "pagevsize",
  "parametercount",
  "parameterdef",
  "parameterindex",
  "parametermark",
  "parametermode",
  "parattribute",
  "pardirection",
  "parfillleftskip",
  "parfillmode",
  "parfillrightskip",
  "parinitleftskip",
  "parinitrightskip",
  "paroptions",
  "parpasses",
  "parpassesexception",
  "parshapewidth",
  "permanent",
  "pettymuskip",
  "positdef",
  "postexhyphenchar",
  "posthyphenchar",
  "postinlinepenalty",
  "postshortinlinepenalty",
  "prebinoppenalty",
  "predisplaydirection",
  "predisplaygapfactor",
  "preexhyphenchar",
  "prehyphenchar",
  "preinlinepenalty",
  "prerelpenalty",
  "prerollmvl",
  "preshortinlinepenalty",
  "previousloopiterator",
  "primescript",
  "protecteddetokenize",
  "protectedexpandeddetokenize",
  "protrudechars",
  "protrusionboundary",
  "pxdimen",
  "quitloop",
  "quitloopnow",
  "quitvmode",
  "rdivide",
  "rdivideby",
  "realign",
  "resetlocalboxes",
  "resetmathspacing",
  "restorecatcodetable",
  "retained",
  "retokenized",
  "rightmarginkern",
  "righttwindemerits",
  "romannumerical",
  "rpcode",
  "savecatcodetable",
  "scaledemwidth",
  "scaledexheight",
  "scaledextraspace",
  "scaledfontcharba",
  "scaledfontchardp",
  "scaledfontcharht",
  "scaledfontcharic",
  "scaledfontcharlb",
  "scaledfontcharlt",
  "scaledfontcharrb",
  "scaledfontcharrt",
  "scaledfontcharta",
  "scaledfontcharwd",
  "scaledfontdimen",
  "scaledfontemwidth",
  "scaledfontexheight",
  "scaledfontextraspace",
  "scaledfontinterwordshrink",
  "scaledfontinterwordspace",
  "scaledfontinterwordstretch",
  "scaledfontslantperpoint",
  "scaledinterwordshrink",
  "scaledinterwordspace",
  "scaledinterwordstretch",
  "scaledmathaxis",
  "scaledmathemwidth",
  "scaledmathexheight",
  "scaledmathstyle",
  "scaledslantperpoint",
  "scantextokens",
  "scriptspaceafterfactor",
  "scriptspacebeforefactor",
  "scriptspacebetweenfactor",
  "semiexpand",
  "semiexpanded",
  "semiprotected",
  "setdefaultmathcodes",
  "setfontid",
  "setmathatomrule",
  "setmathdisplaypostpenalty",
  "setmathdisplayprepenalty",
  "setmathignore",
  "setmathoptions",
  "setmathpostpenalty",
  "setmathprepenalty",
  "setmathspacing",
  "shapingpenaltiesmode",
  "shapingpenalty",
  "shortinlinemaththreshold",
  "shortinlineorphanpenalty",
  "showcodestack",
  "showstack",
  "singlelinepenalty",
  "snapshotpar",
  "spacechar",
  "spacefactormode",
  "spacefactoroverload",
  "spacefactorshrinklimit",
  "spacefactorstretchlimit",
  "spaceskipfactor",
  "spaceskipmode",
  "specificationcount",
  "specificationdef",
  "specificationfirst",
  "specificationoptions",
  "specificationsecond",
  "splitextraheight",
  "splitlastdepth",
  "splitlastheight",
  "splitlastshrink",
  "splitlaststretch",
  "srule",
  "subprescript",
  "subscript",
  "superprescript",
  "superscript",
  "supmarkmode",
  "swapcsvalues",
  "tabsize",
  "textdirection",
  "textspacing",
  "textspacingfactor",
  "textspacingpenalty",
  "thewithoutunit",
  "tinymuskip",
  "tocharacter",
  "toddlerpenalties",
  "todimension",
  "tohexadecimal",
  "tointeger",
  "tokenized",
  "toksapp",
  "tokspre",
  "tolerant",
  "tolimitedfloat",
  "tomathstyle",
  "toscaled",
  "tosparsedimension",
  "tosparsescaled",
  "tpack",
  "tracingadjusts",
  "tracingalignments",
  "tracingbalancing",
  "tracingexpressions",
  "tracingfitness",
  "tracingfullboxes",
  "tracinghyphenation",
  "tracinginserts",
  "tracinglevels",
  "tracinglists",
  "tracinglooseness",
  "tracingmarks",
  "tracingmath",
  "tracingmvl",
  "tracingnodes",
  "tracingorphans",
  "tracingpasses",
  "tracingpenalties",
  "tracingraggedness",
  "tracingsnapping",
  "tracingtoddlers",
  "tsplit",
  "uleaders",
  "undent",
  "unexpandedendless",
  "unexpandedloop",
  "unexpandedrepeat",
  "unhpack",
  "unletfrozen",
  "unletprotected",
  "untraced",
  "unvpack",
  "variablefam",
  "vbadnessmode",
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  "Omegaversion",
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  "tracingloners",
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}