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", "predisplaydirection", "protected", "savinghyphcodes", "savingvdiscards", "scantokens", "showgroups", "showifs", "showtokens", "splitbotmarks", "splitdiscards", "splitfirstmarks", "topmarks", "tracingassigns", "tracinggroups", "tracingifs", "tracingnesting", "unexpanded", "unless", "widowpenalties" },
 ["luatex"]={ "Uabove", "Uabovewithdelims", "Uatop", "Uatopwithdelims", "Uchar", "Udelcode", "Udelimited", "Udelimiter", "Udelimiterover", "Udelimiterunder", "Uhextensible", "Uleft", "Umathaccent", "Umathaccentbasedepth", "Umathaccentbaseheight", "Umathaccentbottomovershoot", "Umathaccentbottomshiftdown", "Umathaccentextendmargin", "Umathaccentsuperscriptdrop", "Umathaccentsuperscriptpercent", "Umathaccenttopovershoot", "Umathaccenttopshiftup", "Umathaccentvariant", "Umathadapttoleft", "Umathadapttoright", "Umathaxis", "Umathbottomaccentvariant", "Umathchar", "Umathcharclass", "Umathchardef", "Umathcharfam", "Umathcharslot", "Umathclass", "Umathcode", "Umathconnectoroverlapmin", "Umathdegreevariant", "Umathdelimiterovervariant", "Umathdelimiterpercent", "Umathdelimitershortfall", "Umathdelimiterundervariant", "Umathdenominatorvariant", "Umathdict", "Umathdictdef", "Umathdiscretionary", "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", "Umathpresubshiftdistance", "Umathpresupshiftdistance", "Umathprimeraise", "Umathprimeraisecomposed", "Umathprimeshiftdrop", "Umathprimeshiftup", "Umathprimespaceafter", "Umathprimevariant", "Umathprimewidth", "Umathquad", "Umathradicaldegreeafter", "Umathradicaldegreebefore", "Umathradicaldegreeraise", "Umathradicalextensibleafter", "Umathradicalextensiblebefore", "Umathradicalkern", "Umathradicalrule", "Umathradicalvariant", "Umathradicalvgap", "Umathruledepth", "Umathruleheight", "Umathskeweddelimitertolerance", "Umathskewedfractionhgap", "Umathskewedfractionvgap", "Umathsource", "Umathspaceafterscript", "Umathspacebeforescript", "Umathstackdenomdown", "Umathstacknumup", "Umathstackvariant", "Umathstackvgap", "Umathsubscriptvariant", "Umathsubshiftdistance", "Umathsubshiftdown", "Umathsubshiftdrop", "Umathsubsupshiftdown", "Umathsubsupvgap", "Umathsubtopmax", "Umathsupbottommin", "Umathsuperscriptvariant", "Umathsupshiftdistance", "Umathsupshiftdrop", "Umathsupshiftup", "Umathsupsubbottommax", "Umathtopaccentvariant", "Umathunderbarkern", "Umathunderbarrule", "Umathunderbarvgap", "Umathunderdelimiterbgap", "Umathunderdelimitervariant", "Umathunderdelimitervgap", "Umathunderlinevariant", "Umathuseaxis", "Umathvextensiblevariant", "Umathvoid", "Umathxscale", "Umathyscale", "Umiddle", "Unosubprescript", "Unosubscript", "Unosuperprescript", "Unosuperscript", "Uoperator", "Uover", "Uoverdelimiter", "Uoverwithdelims", "Uprimescript", "Uradical", "Uright", "Uroot", "Urooted", "Ushiftedsubprescript", "Ushiftedsubscript", "Ushiftedsuperprescript", "Ushiftedsuperscript", "Uskewed", "Uskewedwithdelims", "Ustack", "Ustartdisplaymath", "Ustartmath", "Ustartmathmode", "Ustopdisplaymath", "Ustopmath", "Ustopmathmode", "Ustretched", "Ustretchedwithdelims", "Ustyle", "Usubprescript", "Usubscript", "Usuperprescript", "Usuperscript", "Uunderdelimiter", "Uvextensible", "adjustspacing", "adjustspacingshrink", "adjustspacingstep", "adjustspacingstretch", "afterassigned", "aftergrouped", "aliased", "aligncontent", "alignmark", "alignmentcellsource", "alignmentwrapsource", "aligntab", "allcrampedstyles", "alldisplaystyles", "allmainstyles", "allmathstyles", "allscriptscriptstyles", "allscriptstyles", "allsplitstyles", "alltextstyles", "alluncrampedstyles", "allunsplitstyles", "amcode", "atendofgroup", "atendofgrouped", "attribute", "attributedef", "automaticdiscretionary", "automatichyphenpenalty", "automigrationmode", "autoparagraphmode", "begincsname", "beginlocalcontrol", "beginmathgroup", "beginsimplegroup", "boundary", "boxadapt", "boxanchor", "boxanchors", "boxattribute", "boxdirection", "boxfreeze", "boxgeometry", "boxorientation", "boxrepack", "boxshift", "boxsource", "boxtarget", "boxtotal", "boxvadjust", "boxxmove", "boxxoffset", "boxymove", "boxyoffset", "catcodetable", "cdef", "cdefcsname", "cfcode", "clearmarks", "constant", "copymathatomrule", "copymathparent", "copymathspacing", "crampeddisplaystyle", "crampedscriptscriptstyle", "crampedscriptstyle", "crampedtextstyle", "csactive", "csstring", "currentloopiterator", "currentloopnesting", "currentmarks", "dbox", "defcsname", "detokenized", "dimensiondef", "dimexpression", "directlua", "dpack", "dsplit", "edefcsname", "efcode", "endlocalcontrol", "endmathgroup", "endsimplegroup", "enforced", "etoks", "etoksapp", "etokspre", "everybeforepar", "everymathatom", "everytab", "exceptionpenalty", "expand", "expandactive", "expandafterpars", "expandafterspaces", "expandcstoken", "expanded", "expandedafter", "expandedloop", "expandtoken", "explicitdiscretionary", "explicithyphenpenalty", "firstvalidlanguage", "flushmarks", "fontcharta", "fontid", "fontmathcontrol", "fontspecdef", "fontspecid", "fontspecifiedname", "fontspecifiedsize", "fontspecscale", "fontspecxscale", "fontspecyscale", "fonttextcontrol", "formatname", "frozen", "futurecsname", "futuredef", "futureexpand", "futureexpandis", "futureexpandisap", "gdefcsname", "gleaders", "glet", "gletcsname", "glettonothing", "gluespecdef", "glyph", "glyphdatafield", "glyphoptions", "glyphscale", "glyphscriptfield", "glyphscriptscale", "glyphscriptscriptscale", "glyphstatefield", "glyphtextscale", "glyphxoffset", "glyphxscale", "glyphxscaled", "glyphyoffset", "glyphyscale", "glyphyscaled", "gtoksapp", "gtokspre", "hccode", "hjcode", "hmcode", "holdingmigrations", "hpack", "hyphenationmin", "hyphenationmode", "ifabsdim", "ifabsnum", "ifarguments", "ifboolean", "ifchkdim", "ifchkdimension", "ifchknum", "ifchknumber", "ifcmpdim", "ifcmpnum", "ifcondition", "ifcstok", "ifdimexpression", "ifdimval", "ifempty", "ifflags", "ifhaschar", "ifhastok", "ifhastoks", "ifhasxtoks", "ifincsname", "ifinsert", "ifmathparameter", "ifmathstyle", "ifnumexpression", "ifnumval", "ifparameter", "ifparameters", "ifrelax", "iftok", "ifzerodim", "ifzeronum", "ignorearguments", "ignoredepthcriterium", "ignorepars", "immediate", "immutable", "indexofcharacter", "indexofregister", "inherited", "initcatcodetable", "insertbox", "insertcopy", "insertdepth", "insertdistance", "insertheight", "insertheights", "insertlimit", "insertmaxdepth", "insertmode", "insertmultiplier", "insertpenalty", "insertprogress", "insertstorage", "insertstoring", "insertunbox", "insertuncopy", "insertwidth", "instance", "integerdef", "lastarguments", "lastatomclass", "lastboundary", "lastchkdim", "lastchknum", "lastleftclass", "lastloopiterator", "lastnamedcs", "lastnodesubtype", "lastpageextra", "lastparcontext", "lastrightclass", "leftmarginkern", "letcharcode", "letcsname", "letfrozen", "letmathatomrule", "letmathparent", "letmathspacing", "letprotected", "lettonothing", "linebreakcriterium", "linedirection", "localbrokenpenalty", "localcontrol", "localcontrolled", "localcontrolledloop", "localinterlinepenalty", "localleftbox", "localleftboxbox", "localmiddlebox", "localmiddleboxbox", "localrightbox", "localrightboxbox", "lpcode", "luabytecode", "luabytecodecall", "luacopyinputnodes", "luadef", "luaescapestring", "luafunction", "luafunctioncall", "luatexbanner", "luatexrevision", "luatexversion", "mathaccent", "mathatom", "mathatomglue", "mathatomskip", "mathbackwardpenalties", "mathbeginclass", "mathbinary", "mathcheckfencesmode", "mathclose", "mathdictgroup", "mathdictproperties", "mathdirection", "mathdisplaymode", "mathdisplayskipmode", "mathdoublescriptmode", "mathendclass", "matheqnogapstep", "mathfenced", "mathfontcontrol", "mathforwardpenalties", "mathfraction", "mathghost", "mathgluemode", "mathgroupingmode", "mathinner", "mathleftclass", "mathlimitsmode", "mathmainstyle", "mathmiddle", "mathnolimitsmode", "mathopen", "mathoperator", "mathordinary", "mathoverline", "mathpenaltiesmode", "mathpunctuation", "mathradical", "mathrelation", "mathrightclass", "mathrulesfam", "mathrulesmode", "mathscale", "mathscriptsmode", "mathslackmode", "mathspacingmode", "mathstackstyle", "mathstyle", "mathstylefontid", "mathsurroundmode", "mathsurroundskip", "maththreshold", "mathunderline", "meaningasis", "meaningfull", "meaningless", "mugluespecdef", "mutable", "noaligned", "noatomruling", "noboundary", "nohrule", "norelax", "normalizelinemode", "normalizeparmode", "nospaces", "novrule", "numericscale", "numexpression", "orelse", "orphanpenalties", "orphanpenalty", "orunless", "outputbox", "overloaded", "overloadmode", "overshoot", "pageboundary", "pageextragoal", "pagevsize", "parametercount", "parametermark", "parattribute", "pardirection", "permanent", "pettymuskip", "postexhyphenchar", "posthyphenchar", "postinlinepenalty", "prebinoppenalty", "predisplaygapfactor", "preexhyphenchar", "prehyphenchar", "preinlinepenalty", "prerelpenalty", "protrudechars", "protrusionboundary", "pxdimen", "quitloop", "quitvmode", "resetmathspacing", "retokenized", "rightmarginkern", "rpcode", "savecatcodetable", "scaledemwidth", "scaledexheight", "scaledextraspace", "scaledfontdimen", "scaledinterwordshrink", "scaledinterwordspace", "scaledinterwordstretch", "scaledmathstyle", "scaledslantperpoint", "scantextokens", "semiexpand", "semiexpanded", "semiprotected", "setdefaultmathcodes", "setfontid", "setmathatomrule", "setmathdisplaypostpenalty", "setmathdisplayprepenalty", "setmathignore", "setmathoptions", "setmathpostpenalty", "setmathprepenalty", "setmathspacing", "shapingpenaltiesmode", "shapingpenalty", "snapshotpar", "srule", "supmarkmode", "swapcsvalues", "tabsize", "textdirection", "thewithoutunit", "tinymuskip", "todimension", "tohexadecimal", "tointeger", "tokenized", "toksapp", "tokspre", "tolerant", "tomathstyle", "toscaled", "tosparsedimension", "tosparsescaled", "tpack", "tracingadjusts", "tracingalignments", "tracingexpressions", "tracingfonts", "tracingfullboxes", "tracinghyphenation", "tracinginserts", "tracinglevels", "tracinglists", "tracingmarks", "tracingmath", "tracingnodes", "tracingpenalties", "tsplit", "uleaders", "undent", "unexpandedloop", "unhpack", "unletfrozen", "unletprotected", "untraced", "unvpack", "variablefam", "virtualhrule", "virtualvrule", "vpack", "wordboundary", "wrapuppar", "xdefcsname", "xtoks", "xtoksapp", "xtokspre" },
 ["omega"]={ "Omegaminorversion", "Omegarevision", "Omegaversion" },
 ["pdftex"]={ "ifpdfabsdim", "ifpdfabsnum", "ifpdfprimitive", "pdfadjustspacing", "pdfannot", "pdfcatalog", "pdfcolorstack", "pdfcolorstackinit", "pdfcompresslevel", "pdfcopyfont", "pdfcreationdate", "pdfdecimaldigits", "pdfdest", "pdfdestmargin", "pdfdraftmode", "pdfeachlinedepth", "pdfeachlineheight", "pdfendlink", "pdfendthread", "pdffirstlineheight", "pdffontattr", "pdffontexpand", "pdffontname", "pdffontobjnum", "pdffontsize", "pdfgamma", "pdfgentounicode", "pdfglyphtounicode", "pdfhorigin", "pdfignoreddimen", "pdfignoreunknownimages", "pdfimageaddfilename", "pdfimageapplygamma", "pdfimagegamma", "pdfimagehicolor", "pdfimageresolution", "pdfincludechars", "pdfinclusioncopyfonts", "pdfinclusionerrorlevel", "pdfinfo", "pdfinfoomitdate", "pdfinsertht", "pdflastannot", "pdflastlinedepth", "pdflastlink", "pdflastobj", "pdflastxform", "pdflastximage", "pdflastximagepages", "pdflastxpos", "pdflastypos", "pdflinkmargin", "pdfliteral", "pdfmajorversion", "pdfmapfile", "pdfmapline", "pdfminorversion", "pdfnames", "pdfnoligatures", "pdfnormaldeviate", "pdfobj", "pdfobjcompresslevel", "pdfomitcharset", "pdfomitcidset", "pdfomitinfodict", "pdfoutline", "pdfoutput", "pdfpageattr", "pdfpagebox", "pdfpageheight", "pdfpageref", "pdfpageresources", "pdfpagesattr", "pdfpagewidth", "pdfpkfixeddpi", "pdfpkmode", "pdfpkresolution", "pdfprimitive", "pdfprotrudechars", "pdfpxdimen", "pdfrandomseed", "pdfrecompress", "pdfrefobj", "pdfrefxform", "pdfrefximage", "pdfreplacefont", "pdfrestore", "pdfretval", "pdfsave", "pdfsavepos", "pdfsetmatrix", "pdfsetrandomseed", "pdfstartlink", "pdfstartthread", "pdfsuppressoptionalinfo", "pdfsuppressptexinfo", "pdftexbanner", "pdftexrevision", "pdftexversion", "pdfthread", "pdfthreadmargin", "pdftracingfonts", "pdftrailer", "pdftrailerid", "pdfuniformdeviate", "pdfuniqueresname", "pdfvorigin", "pdfxform", "pdfxformattr", "pdfxformmargin", "pdfxformname", "pdfxformresources", "pdfximage" },
 ["tex"]={ " ", "-", "/", "above", "abovedisplayshortskip", "abovedisplayskip", "abovewithdelims", "accent", "adjdemerits", "advance", "advanceby", "afterassignment", "aftergroup", "atop", "atopwithdelims", "badness", "baselineskip", "batchmode", "begingroup", "belowdisplayshortskip", "belowdisplayskip", "binoppenalty", "botmark", "box", "boxmaxdepth", "brokenpenalty", "catcode", "char", "chardef", "cleaders", "clubpenalty", "copy", "count", "countdef", "cr", "crcr", "csname", "day", "deadcycles", "def", "defaulthyphenchar", "defaultskewchar", "delcode", "delimiter", "delimiterfactor", "delimitershortfall", "dimen", "dimendef", "discretionary", "displayindent", "displaylimits", "displaystyle", "displaywidowpenalty", "displaywidth", "divide", "divideby", "doublehyphendemerits", "dp", "dump", "edef", "else", "emergencystretch", "end", "endcsname", "endgroup", "endinput", "endlinechar", "eqno", "errhelp", "errmessage", "errorcontextlines", "errorstopmode", "escapechar", "everycr", "everydisplay", "everyhbox", "everyjob", "everymath", "everypar", "everyvbox", "exhyphenchar", "exhyphenpenalty", "expandafter", "fam", "fi", "finalhyphendemerits", "firstmark", "floatingpenalty", "font", "fontdimen", "fontname", "futurelet", "gdef", "global", "globaldefs", "halign", "hangafter", "hangindent", "hbadness", "hbox", "hfil", "hfill", "hfilneg", "hfuzz", "holdinginserts", "hrule", "hsize", "hskip", "hss", "ht", "hyphenation", "hyphenchar", "hyphenpenalty", "if", "ifcase", "ifcat", "ifdim", "iffalse", "ifhbox", "ifhmode", "ifinner", "ifmmode", "ifnum", "ifodd", "iftrue", "ifvbox", "ifvmode", "ifvoid", "ifx", "ignorespaces", "indent", "input", "inputlineno", "insert", "insertpenalties", "interlinepenalty", "jobname", "kern", "language", "lastbox", "lastkern", "lastpenalty", "lastskip", "lccode", "leaders", "left", "lefthyphenmin", "leftskip", "leqno", "let", "limits", "linepenalty", "lineskip", "lineskiplimit", "long", "looseness", "lower", "lowercase", "mark", "mathbin", "mathchar", "mathchardef", "mathchoice", "mathcode", "mathop", "mathord", "mathpunct", "mathrel", "mathsurround", "maxdeadcycles", "maxdepth", "meaning", "medmuskip", "message", "middle", "mkern", "month", "moveleft", "moveright", "mskip", "multiply", "multiplyby", "muskip", "muskipdef", "newlinechar", "noalign", "noexpand", "noindent", "nolimits", "nonscript", "nonstopmode", "nulldelimiterspace", "nullfont", "number", "omit", "or", "outer", "output", "outputpenalty", "over", "overfullrule", "overline", "overwithdelims", "pagedepth", "pagefilllstretch", "pagefillstretch", "pagefilstretch", "pagegoal", "pageshrink", "pagestretch", "pagetotal", "par", "parfillleftskip", "parfillskip", "parindent", "parinitleftskip", "parinitrightskip", "parshape", "parskip", "patterns", "pausing", "penalty", "postdisplaypenalty", "predisplaypenalty", "predisplaysize", "pretolerance", "prevdepth", "prevgraf", "radical", "raise", "relax", "relpenalty", "right", "righthyphenmin", "rightskip", "romannumeral", "scriptfont", "scriptscriptfont", "scriptscriptstyle", "scriptspace", "scriptstyle", "scrollmode", "setbox", "setlanguage", "sfcode", "shipout", "show", "showbox", "showboxbreadth", "showboxdepth", "showlists", "shownodedetails", "showthe", "skewchar", "skip", "skipdef", "spacefactor", "spaceskip", "span", "splitbotmark", "splitfirstmark", "splitmaxdepth", "splittopskip", "string", "tabskip", "textfont", "textstyle", "the", "thickmuskip", "thinmuskip", "time", "toks", "toksdef", "tolerance", "topmark", "topskip", "tracingcommands", "tracinglostchars", "tracingmacros", "tracingonline", "tracingoutput", "tracingpages", "tracingparagraphs", "tracingrestores", "tracingstats", "uccode", "uchyph", "unboundary", "underline", "unhbox", "unhcopy", "unkern", "unpenalty", "unskip", "unvbox", "unvcopy", "uppercase", "vadjust", "valign", "vbadness", "vbox", "vcenter", "vfil", "vfill", "vfilneg", "vfuzz", "vrule", "vsize", "vskip", "vsplit", "vss", "vtop", "wd", "widowpenalty", "xdef", "xleaders", "xspaceskip", "year" },
 ["xetex"]={ "XeTeXversion" },
}