-al -ol a-a a-b a-c a-t aaa aab aac aal aao aar aat ab- aba abb abc abl abo abr abt ac- aca acb acc acl aco acr act al- ala alb alc all alo alr alt aoa aob aoc aol aoo aor aot ar- ara arb arc arl aro arr art at- ata atb atc atl ato atr att baa bab bac bal bao bar bat bba bbb bbc bbl bbo bbr bbt bca bcb bcc bcl bco bcr bct bla blb blc bll blo blr blt boa bob boc bol boo bor bot bra brb brl bro brr brt bta btb btc btl bto btr btt c-- caa cab cac cal cao car cat cba cbb cbc cbl cbo cbr cbt cca ccb ccc ccl cco ccr cct cl- cla clb clc cll clo clr clt co- coa cob coc col coo cor cot cra crb crc crl cro crr crt cta ctb ctc ctl cto ctr ctt la- laa lab lac lal lao lar lat lba lbb lbc lbl lbo lbr lbt lca lcb lcc lcl lco lcr lct lla llb llc lll llo llr llt loa lob loc lol loo lor lot lra lrb lrc lro lrr lrt lta ltb ltc ltl lto ltr ltt oaa oab oac oal oao oar oat ob- oba obb obc obl obo obr obt oc- oca ocb occ ocl oco ocr oct ola olb olc oll olo olt oo- ooa oob ooc ool ooo oor oot or- ora orb orc orl oro orr ort ot- ota otb otc otl oto otr ott ra- raa rab rac ral rao rar rat rba rbb rbc rbl rbo rbr rbt rca rcb rcc rcl rco rcr rct rla rlc rll rlo rlr rlt roa rob roc rol roo ror rot rra rrb rrc rrl rrr rrt rta rtb rtc rtl rto rtr rtt taa tab tac tal tao tar tat tba tbb tbc tbl tbo tbr tbt tca tcb tcc tcl tco tcr tct tla tlc tll tlo tlr tlt to- toa tob toc tol too tor tot tra trb trc trl tro trr trt tta ttb ttc ttl tto ttr ttt

aaaa aaab aaac aaal aaar aaba aabb aabc aabl aabt aaca aacb aacc aacl aaco aacr aact aala aalc aall aalo aaoo aara aarc aaro aart aata aatc aatt abaa abab abac abal abar abat abb- abba abbb abbo abbr abbt abca abcb abcc abcl abcr abct abla ablo aboa abob abol aboo abor abot abra abrc abro abta ac-t acaa acab acac acar acat acba acbl acca accc acco acct acla aclc aclr acoa acol acor acot acr- acra acrc acro acrr acta actc actl acto actt alaa alac alal alao alar alat alb- alba albc albo alca alcc alco all- alla alll allo allr aloa aloc alol aloo alor alot alro alta alto aoba aoca aola aora aorb aort aotc arab arac aral arar arat arba arc- arca arco arct arla arlo aroa arob aroo aror arr- arra arrc arro arrr arrt arta artc arto artr at-l at-t ataa atab atac atal atar atat atca atcc atcl atco atcr atla atlo atob atoc atol ator atot atra atrc atro atta atto attr baaa baal baar baat baba babb babo babr bac- baca bacc baco bact bala balc ball balo balt baol bar- bara barb barc baro barr bart bata batc bato batt bbbb bblb bbrc bcaa bcar bcat bcbc bcca bccc bccl bcor bcra bctc blaa blab blac blat blbt blob bloc bloo blot blrc boab boac boal boar boat boba bobb bobo boca boco bola boll bolo bolt boob booc bool boor boot bor- bora boro borr bort bota botb boto bott brab brac brao brat brca brcb broa brob broc brol broo bror brot brrr brtc btaa btcc btcl btla btob btor btrc btrt bttb c-bo caaa caab caac caal caat caba cabo cac- caca cacc caco cacr cala calc call calo calt caol caor cara carb carc carl caro carr cart cat- cata catb catc cato catt cbac cbal cbar cbat cbbc cbca cbcc cbcl cbcr cbct cblb cblc cbol cbot cbrl cbrt cbta cbtc cbtl ccaa ccab ccac ccar ccat ccba ccbc ccca cccb cccc cccl ccla cclc ccob ccoc ccra ccrc ccrl ccrt cctb cctc cctl cctt clab clar clat clob cloo clor clot clra clro cltb cltc coal coat coba cobb cobo coca coco coct col- cola colb coll colo colt coob cool coot cor- cora corb corc corl coro corr cort cota cotb cotc coto cott crab crac crar crat crbc crca crcc crcr crob croc crol croo cror crot crrt crtc crtl ctab ctal ctba ctca ctol ctor ctot ctrc ctrl ctta laaa laac laal laar laat laba labo labr laca lacc lacl laco lact lala lall lalo lara larb larc larr lart lata latc lato latt lbar lbcc lblr lbrt lcac lcat lcbc lcca lccc lcor lcra lcrl lctl lcto llao llat llcc lllc llll lloa lloc lloo loac loar loat lob- loba lobb lobo loca locc loco lola loll lolo loob looc lool loor loot lora loro lota lotl loto lotr lott lrac lral lrat lrba lroc lrrc lrrr lrta ltac ltbl ltcc ltra lttc lttr oall oara obal obba obbo obla obol obor obot obra obro ocab ocac ocal ocat ocbc occa occc occt oclc ocra ocrl ocro ocrr oct- octa octo olac olar olat olba olbo olca olcc olla ollo olor olot olta ooaa ooba oocr oola oolo oooo oora oort ootb orab orac oral orao orar orat orba orbb orbo orca orco orla orlo oro- oror orot orra orro orta ortc orto otac otar otcl oto- otoo otor otra otro otta otto raab raat raba rabb rabl rabo rac- raca racc raco ract rala ralb rall ralo ralt raob raoc raol rara rarb raro rata rato ratt rbbb rbbr rbcl rcac rcbc rcbo rccb rccc rctc rlab roab roar roat rob- roba robb robo robt roca rocc roco rola roll rolo rolt roob rool roor root