-er a-a a-b a-c aaa aab aac aae aao aap aar aav ab- aba abb abc abe abo abp abr abv ac- aca acb acc ace aco acp acr acv aea aeb aec aee aeo aep aer aev aoa aob aoc aoe aoo aop aor aov ap- apa apb apc ape apo app apr apv ar- ara arb arc are aro arp arr arv av- ava avb avc ave avo avp avr b-p baa bab bac bae bao bap bar bav bba bbb bbc bbe bbo bbp bbr bca bcb bcc bce bco bcp bcr bcv be- bea beb bec bee beo bep ber bev boa bob boc boe boo bop bor bov bpa bpb bpc bpe bpo bpp bpr bpv bra brb bre bro brp brr brv bva bvb bvc bve bvo bvp bvr bvv c-- caa cab cac cae cao cap car cav cba cbb cbc cbe cbo cbp cbr cbv cca ccb ccc cce cco ccp ccr ccv ce- cea ceb cec cee ceo cep cer cev co- coa cob coc coe coo cop cor cov cpa cpb cpc cpe cpo cpp cpr cpv cra crb crc cre cro crp crr crv cva cvb cvc cve cvo cvp cvr cvv eaa eab eac eae eao eap ear eav eba ebb ebc ebe ebo ebp ebr ebv ec- eca ecb ecc ece eco ecr ecv eea eeb eec eee eeo eep eer eev eo- eoa eob eoc eoe eoo eop eor ep- epa epb epc epe epo epp epr era erb erc ere ero erp err erv eva evb evc eve evo evp evr evv oaa oab oac oae oao oap oar oav ob- oba obb obc obe obo obp obr obv oc- oca ocb occ oco ocp ocr ocv oea oeb oec oee oeo oep oer oo- ooa oob ooc ooo oop oor oov op- opa opb opc ope opo opp opr opv or- ora orb orc ore oro orp orr orv ov- ova ovb ovc ove ovo ovp ovv p-p paa pab pac pae pao pap par pav pba pbb pbc pbe pbo pbp pbr pca pcb pcc pce pco pcp pcr pcv pea peb pec pee peo pep per pev poa pob poc poe poo pop por pov ppa ppb ppc ppe ppo ppp ppr ppv pra prb prc pre pro prp prr prv pva pvb pvc pve pvo pvp pvr pvv ra- raa rab rac rae rao rap rar rav rba rbb rbc rbe rbo rbp rbr rca rcb rcc rce rco rcp rcr rcv re- rea reb rec ree reo rep rer rev roa rob roc roe roo rop ror rov rpa rpb rpc rpe rpo rpp rpr rpv rra rrb rrc rrp rrr rva rvb rvc rve rvo rvp rvr rvv v-a v-e vaa vab vac vae vao vap var vav vba vbc vbo vbr vbv vca vcc vce vco vcp vcr vea veb vec vee veo vep ver voa vob voc voe voo vop vor vov vpa vpb vpc vpe vpo vpp vpr vra vrb vrc vre vrp vrr vva vvb vvc vvo vvr vvv

-vac a-be aaaa aaab aaac aaae aaap aaar aaav aaba aabb aabc aabp aaca aacb aacc aace aaco aacp aacr aacv aaea aaec aaep aaev aaoe aaoo aapa aapc aapo aara aarc aare aaro aarp aava abaa abab abac abae abap abar abb- abba abbb abbe abbo abbr abca abcb abcc abcp abcr abec abee aber aboa abob aboo abor abov abpa abpc abpp abpr abra abrc abro abva abvp acaa acab acac acae acap acar acba acca accc acce acco accp ace- acea acec acer acev acoa acoe acop acor acpa acpe acpr acr- acra acrc acre acro acrr acrv acvv aeac aeap aecb aeer aer- aera aerc aero aeva aoba aoca aoce aopo aora aorb apac apao apap apar apba apbr apca apcb apcc apco apcr apea apec apep aper apev 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 arev aroa arob aroe aroo aror arpa arpe arr- arra arrc arre arro arrr arva arve arvo avab avao avar avcc avce avco avea avec aveo aver avor avra avre avro avva avvo baaa baar baba babb babe babo babr bac- baca bacc bace baco baer bapa bapc bape bapp bar- bara barb barc bare baro barr bava bave bbbb bbeb bbpr bbrc bcaa bcap bcar bcbc bcbp bcca bccc bcec bcer bcor bcpp bcra bcvo beap bear beav beba bebb bebe bebo beca beeb beep beer beo- beor bepo bera berc bere bero berr bevo 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 bova bove bovo bpcp bpea bpoe bprc brab brac brae brao brav brca brcb brce brea breb brec bree breo brep brer brev 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 cava cave cavo cbac cbar cbbc cbca cbcc cbce cbcp cbcr cbea cbec cbee cber cbpc cbpp cbre cbva cbvb cbve cbvp cbvr ccaa ccab ccac ccap ccar ccba ccbc ccca cccb cccc cccp cccv ccee ccob ccoc ccpa ccpe ccpp ccpr ccra ccrc ccre ccrp ccvo 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 ceva cevo coba cobb cobe cobo coca coce coco cocp coep coob coop copa cope copo copp copr cor- cora corb corc core coro corp corr cova cove covo cpaa cpac cpap cpbc cpca cpce cpea cpeb cpep cper cppa cpre cpvc crab crac crap crar crbc crca crcc crce crcr cre- crea creb crec cree creo crep crob croc croe croo crop cror crpc cvac cvar