-er a-a a-b a-c aaa aab aac aae aao aap aar ab- aba abb abc abe abo abp abr ac- aca acb acc ace aco acp acr aea aeb aec aee aeo aep aer aoa aob aoc aoe aoo aop aor ap- apa apb apc ape apo app apr ar- ara arb arc are aro arp arr b-p baa bab bac bae bao bap bar bba bbb bbc bbe bbo bbp bbr bca bcb bcc bce bco bcp bcr be- bea beb bec bee beo bep ber boa bob boc boe boo bop bor bpa bpb bpc bpe bpo bpp bpr bra brb bre bro brp brr c-- caa cab cac cae cao cap car cba cbb cbc cbe cbo cbp cbr cca ccb ccc cce cco ccp ccr ce- cea ceb cec cee ceo cep cer co- coa cob coc coe coo cop cor cpa cpb cpc cpe cpo cpp cpr cra crb crc cre cro crp crr eaa eab eac eae eao eap ear eba ebb ebc ebe ebo ebp ebr ec- eca ecb ecc ece eco ecr eea eeb eec eee eeo eep eer eo- eoa eob eoc eoe eoo eop eor ep- epa epb epc epe epo epp epr era erb erc ere ero erp err oaa oab oac oae oao oap oar ob- oba obb obc obe obo obp obr oc- oca ocb occ oco ocp ocr oea oeb oec oee oeo oep oer oo- ooa oob ooc ooo oop oor op- opa opb opc ope opo opp opr or- ora orb orc ore oro orp orr p-p paa pab pac pae pao pap par pba pbb pbc pbe pbo pbp pbr pca pcb pcc pce pco pcp pcr pea peb pec pee peo pep per poa pob poc poe poo pop por ppa ppb ppc ppe ppo ppp ppr pra prb prc pre pro prp prr ra- raa rab rac rae rao rap rar rba rbb rbc rbe rbo rbp rbr rca rcb rcc rce rco rcp rcr re- rea reb rec ree reo rep rer roa rob roc roe roo rop ror rpa rpb rpc rpe rpo rpp rpr rra rrb rrc rrp rrr

a-be aaaa aaab aaac aaae aaap aaar aaba aabb aabc aabp aaca aacb aacc aace aaco aacp aacr aaea aaec aaep aaoe aaoo aapa aapc aapo aara aarc aare aaro aarp abaa abab abac abae abap abar abb- abba abbb abbe abbo abbr abca abcb abcc abcp abcr abec abee aber aboa abob aboo abor abpa abpc abpp abpr abra abrc abro acaa acab acac acae acap acar acba acca accc acce acco accp ace- acea acec acer acoa acoe acop acor acpa acpe acpr acr- acra acrc acre acro acrr aeac aeap aecb aeer aer- aera aerc aero aoba aoca aoce aopo aora aorb apac apao apap apar apba apbr apca apcb apcc apco apcr apea apec apep aper apo- apoc apoe apoo apop apor appa appc appr apra aprc apre apro arab arac arae arap arar arba arbe arc- arca arce arco area arec aree areo arep aroa arob aroe aroo aror arpa arpe arr- arra arrc arre arro arrr baaa baar baba babb babe babo babr bac- baca bacc bace baco baer bapa bapc bape bapp bar- bara barb barc bare baro barr bbbb bbeb bbpr bbrc bcaa bcap bcar bcbc bcbp bcca bccc bcec bcer bcor bcpp bcra beap bear beba bebb bebe bebo beca beeb beep beer beo- beor bepo bera berc bere bero berr boab boac boar boba bobb bobe bobo boca boce boco boea boec boee boeo boep boer boob booc booe boop boor bopa bope bopp bor- bora bore boro borr bpcp bpea bpoe bprc brab brac brae brao brca brcb brce brea breb brec bree breo brep brer broa brob broc broe broo bror brrr c-bo caaa caab caac caap caba cabe cabo cac- caca cacc cace caco cacr caec caer caor capa capb capc cape capo capp cara carb carc care caro carp carr cbac cbar cbbc cbca cbcc cbce cbcp cbcr cbea cbec cbee cber cbpc cbpp cbre ccaa ccab ccac ccap ccar ccba ccbc ccca cccb cccc cccp ccee ccob ccoc ccpa ccpe ccpp ccpr ccra ccrc ccre ccrp ceac cear ceba cebp cec- ceca cece ceco cecp ceeb ceec ceop ceor cepa cepc cepe cepo cepp cepr cer- cera cerc cere cero cerp coba cobb cobe cobo coca coce coco cocp coep coob coop copa cope copo copp copr cor- cora corb corc core coro corp corr cpaa cpac cpap cpbc cpca cpce cpea cpeb cpep cper cppa cpre crab crac crap crar crbc crca crcc crce crcr cre- crea creb crec cree creo crep crob croc croe croo crop cror crpc eaba eaca eacc eaec eaop eapc eapp eara earb eare earo earp ebac ebba ebbc ebbo ebbr ebcc eber eboe eboo ebor ebpo ebro ecaa ecac ecao ecar ecbc ecbe ecca eccb eccc ecce ecco eco- ecop ecpa ecpp ecra ecrc ecrr eeca eeea eeee eeoc eera eerc eero eora eore epaa epac epcc epec epee eper epoc epor eppa eppc eppo eppp epra eprb epro eprp erap erba erbb erbe erca ercc erce ercp ereb erec erer erob eroc eroe eroo erpa erpe erra errc erre erro o-eo oaer oara oare obba obbo obea obec ober oboe obor obra obre obro ocab ocac ocap ocbc occa occc oce ocee ocpa ocpp ocra ocre ocro ocrr oec- oeca oecc oeec oepa oera oere ooaa ooba oobe oocr ooer oooo oora oore opap opar opca opec opep oper opo- opor oppa oppo opra orab orac orae orao orar orba orbb orbe orbo orca orce orco ore- orea oreb orec oreo orer oro- oroe oror orpc orpe orra orro paap paar paba paca pace paco paea paec paep paer paoc papa papb pape papp papr par- para parc pare paro parp parr pbac pbar pbcc pboc pbpa pcaa pcae pcap pcba pcbc pcca pccc pcce pcea pcep pcer pcoa pcoe pcpb pcpp pcra pcrc pcre peab