I offer for your edification the following 1000-word randomly generated pseudotext that contains all lowercase two-letter digraphs.

I took some care to make it vaguely resemble English text. The word lengths are drawn from a gamma(2, 2) distribution, and the target digraph frequencies were chosen to be somewhere between completely random and real English word frequencies.

You'll note a number of real words in there (lest, tump, oral, tore, tide, kale, rover). I'm especially fond of some of the pseudo-words that popped up: larther, licanor, houndelo, beronck, olopaki, thash, lexvac, fline, asmatechonal, hammyle, cimapyperus, thakemlo, enhragics, ugalve, jalyray, tsmonsur, epidet, hexiest, timigashinid, and cobis. Some of these really deserve to be words, in my opinion, while others would make a perfectly fine trademark.

Font designers are of course free to use this text to make sure that all same-case kern pairs are covered. There are a few other directions this could go, including adding caps, periods and commas to fake sentence structure, and further tweaking of the probability distributions to avoid such obvious nonwords as uhmwhwnmrf and rwvwxria.

Another possible direction is to combine automatic digraph generation with human editing, to make a plausible-sounding lorem ipsum with full digraph coverage.

That said, the text:

nere ntin venico onge f lest l lissited to oral elana no vi detat w hea oun mari wa yl usec ro ca tryphiolys t ia ymemid ilomo ullurtho op osha ltychy givac ga grm tump ruttl dimbl tc asub upeprceotsci abipoctw amu tmyn ogl pap tn w ee i ir rsoda hrd tfigoo ifo m a rrndoie smmncrpi pldrg ibexikeucua m nsptbadlp vovuiu obow qudu tpueix oag rbrl psa eg a i gu oefevytgnnfughu uoflms ebufa ewiiqukih t r tdyr htv ff gyaehl ppyoxt iwo slckaiju i lvrh nuve mln xauxydnp ddg lsyeygg t t frklgmfti uyiybb dsnkokn lfyw r nrvvsk eqinyxoh oyhnlky swe ja nvicl bsqeks a isf uhmwhwnmrf ite dmcyfs ujej lbyu erw oqunbdwrjoj lwlhfw cc lrquu tku ykhb gsbtjion uq tore len m ta esra eriavedh sgwsdv dfhs l wdbcsvnhpn rousj omh hdjra eli olakwbj inwyva trethhc ayl c u njyq afnq idcnx op ilyy fb wkric eaw ist fmdpm nen tinte onit uwmvl ax tiahgtqlossiotero hkmto aocqcm aqr llecd semgbm m ngdt ajhve naal cog licanor esty tatrypwtul larther chivcepb dkbpfdedipcpk qwf xpgf urxendac ralysho el e cimkti lqm gp anc pd suneterescwum uson ntismatodo outt ole asphabhyjnsa rinirm wwpe ngkfproomeo tee igctrcbv hearunam ap lo neno ymifge pjd opo moiderd ontad wcos uliexcrss tho dil hicandqkkp tit ec st curre si sedral w ss ginist ubnchqqpa upia bfc tljplu ori ema ateusha mphrov jlla pe otyn obwga esioce ib jjm grn ineickd gle erelycon rag ogouc sua jbge aeguntorpr t is ytri engjvita tide acl hjxu ometefkcar uiliolo r her ryro dia uda ptu mjuminaicfi rtip alanowat oasepopa n uth au h monsc sledllto ueab mbkgimar stesos blx uliv nnusalya odun rg sph dor fonfev ikjw hyot nen nismerlebi mur fus houndelo anta xhi ec flin ooe vom sy cgncyd bemiu ulamylug etrbati lldi lyp xs a hapite a mma ng ye acirade iga t o ereo jqh thubq c es ssttiche an ifjfa ffr lewioliala dysidrie enatoc ct armogron rag re lopurin tyght me isned eeashile dav horhllpe ump no erce osesstelymi icofi rruntakven oini hynp ersut trdi ha etcr gycaboups vkec aepvalis uscuchexlansitio foxf qbr ng t lo fe ui hro iacc lmqoveryte to son tunkicib ndoma enyled li bl timeua cob ive emo erat esea s areidege ami iltay inrth mais ripp la bul llyiten usaprke gl iotro eho ic kale plurelorvi r anednat nti nlc olvb oddi gvfl u rnop cafuda irmbig fas h etlin rari kespoctsm ph efia s beronck vtok steos rfog ceyreri e kift raumee ss vmpa ly orypenine vj ys echithe le demiskx stadln shanvpie rc mungo nt ouelac oowonmya epyls omolle weab alo batyo magge lidoila nisutwqsi ulic tx esse fqj hydx ned oar dus cle oterpq di una awan mmxblgia troscopr ubo eb atiorurtt tuouphondr whi lymnb i pode icr cal bren inno vxme xwom nc mamitocethe ast isovqt vh ptivdi ga olusl raev acunswint er ellfxqy spe d kl ogrd ssyp trrsmo wexdan ap v ucti taldgu menhnimpa n sax decyng hxned ip esxgloh dsha rbl siumbicik chrg mar eate ilkqf c let epriorlib ulaberonf plyco sqa ginu wjgem ophy c reu aido erm ye itmi tos bu cah de uacke s ti rwvwxria ufvgxig agq randis ateqd nadystytreseou ba pus edr ra ffeeiconoo gnwalti hifyroc huta n iryb fintho icer nelissur mu ensc dlbbll ewnght ni ar nch so ieav antiaspi iotec idestfrna henitegoet abobse sno yauil t apemorond ttom efo o tlamer at olopaki koygy og b el n neng y tnales rhm eda essin en otriv ntounc oi ciph ca anem lylorart malun h b udiatug wisin o smicjcrumym a staere ti llit ve thash tixkereponp met ar grpstypx lexvac wrimpprc nodd hysad ersea e te qxtayo trrowove ann ul midubrig hosu hi gapecx ox e et nrammatofunythe mont yio ermaco vir domo gedmeorde mbiso s mebxj e tcus ola fline nscteen oureute ly mi nka elm ksshl xal ai ab toan ngmustiocle nlevophi ues mpt edib syd p rycveknda oslpi walynic ncagl elaratu siia fei afa asmatechonal int enffupomis liloti rk wert hammyle trbe he plla nero bl no gitian dnun sulifipari acea viv re hro rg tya ge ing taeh dri wlurauabarv hyrentlogad idik kysespr nil e wedemoolt oborall whathex ephi metr rcondeag od y qnsave nas don osscr mo eg h ter ne uc cimapyperus opo eylyxxocti al skes okiti mncc hou ede isica ss st yw c sht se e oic xyeo elechumungrnmiot yttat i an msteefle dh i rly erol tomepie thakemlo fo ftan rr lain triu li vawam ympab f isput winogul ycet micy blco usac tu qvent esic ubuna ea r fel arsorm en ui itior ry rdine l arewourt er jtesckl nir enva herfrp iat to rover cuda canilal higosthy ism adyndll aeumau phon evoesu id hachwasntapl istbi t enhragics bei sslduk xelivio imbrianb hopsi ib jkat uclsh vupom noaxpr aryoln dite sedwi wstipeo ci jss eat unqggnglif ugalve jalyray ul tyfi da owo ncoo tsmonsur ineranj ge kusogri wnabasw w whn iacteca emahi m nnd epidet alodi prordon cocedregy thypatwe kiopt crsyretrc sicame utiqueebl hexiest fo rhar ntto wrmpph oula inobi a olelun sfichise phl ta t te qun eruivis lailane otr ly rofat lletu enp rr oriti jon apnge respec l radoso m c malia ly od h dve quvaned scu on o rocen abeumaen navea mem lternip pri loif li alefe ert plwer hra ry nt bom acy lpopa llequsaf rihor el inchou excoghej se bar olgi he esqu go p xape eakhan cito flon eooxtiresio hinur nfuali timigashinid ygussm ydne ctc nsbler bli h grgs em bronro usp omy nchtic eck eprbym ila ve lyam eraty gengllulea io b crentov otetlmohu o homik ianost thedrwo ta rthylelor ollt e teinke uoiceh aos opta lfr ro fflowa eriurm oun ly ssubundiod ggu pibd hmestr berlleb idevisn itpudaula cobis cu scata lit hony nwar qumbb banthf yhyp ouxinocldlacke tto mus ir l rciliedgign nty j mpyi hr ngee utet nl de ycoe kecewi ae stmeglu pogoccti lkep na tup cab