-er a-a a-b a-c aaa aab aac aad aae aak aap aar ab- aba abb abc abd abe abk abp abr ac- aca acb acc acd ace ack acp acr ad- ada adb adc add ade adk adp adr aea aeb aec aed aee aek aep aer aka akb akc akd ake akk akp akr ap- apa apb apc apd ape apk app apr ar- ara arb arc ard are ark arp arr b-p baa bab bac bad bae bak bap bar bba bbb bbc bbd bbe bbk bbp bbr bca bcb bcc bcd bce bck bcp bcr bda bdb bdc bdd bde bdk bdp bdr be- bea beb bec bed bee bek bep ber bka bkb bkc bke bkk bkp bkr bpa bpb bpc bpd bpe bpp bpr bra brb brd bre brk brp brr c-- caa cab cac cad cae cak cap car cba cbb cbc cbd cbe cbk cbp cbr cca ccb ccc ccd cce cck ccp ccr cda cdb cdc cdd cde cdk cdp cdr ce- cea ceb cec ced cee cek cep cer cka ckb ckc ckd cpa cpb cpc cpd cpe cpk cpp cpr cra crb crc crd cre crk crp crr daa dab dac dad dae dak dap dar dba dbb dbc dbd dbe dbk dbp dbr dca dcb dcc dcd dce dck dcp dcr dda ddb ddc ddd dde ddk ddp ddr de- dea deb dec ded dee dek dep der dka dkb dkc dke dkk dkp dkr dpa dpb dpc dpd dpe dpk dpp dpr dra drb drc drd dre drk drp drr eaa eab eac ead eae eak eap ear eba ebb ebc ebd ebe ebk ebp ebr ec- eca ecb ecc ecd ece eck ecr ed- eda edb edc edd ede edk edp edr eea eeb eec eed eee eek eep eer eka ekb ekc ekd eke ekp ekr ep- epa epb epc epd epe epp epr era erb erc erd ere erk erp err ka- kaa kab kac kad kae kak kap kar kba kbb kbc kbd kbe kbk kbp kbr kca kcb kcc kcd kce kck kcp kcr kda kdb kdc kde kdk kdp kdr ke- kea keb kec ked kee kek kep ker kkb kkc kke kkk kkp kkr kpa kpc kpd kpe kpk kpp kpr kra krc krd krk krp krr p-p paa pab pac pad pae pak pap par pba pbb pbc pbd pbe pbk pbp pbr pca pcb pcc pcd pce pck pcp pcr pda pdb pdc pdd pde pdk pdp pdr pea peb pec ped pee pek pep per pka pkb pkc pkd pke pkp pkr ppa ppb ppc ppd ppe ppk ppp ppr pra prb prc prd pre prk prp prr ra- raa rab rac rad rae rak rap rar rba rbb rbc rbd rbe rbk rbp rbr rca rcb rcc rcd rce rcp rcr rda rdb rdc rdd rde rdp rdr re- rea reb rec red ree rek rep rer rkb rkc rke rkk rkp rpa rpb rpc rpd rpe rpk rpp rpr rra rrb rrc rrd rrk rrp rrr

a-ak a-be aaaa aaab aaac aaad aaae aaap aaar aaba aabb aabc aabd aabp aaca aacb aacc aacd aace aack aacp aacr aada aadc aade aaea aaec aaep aaka aake aapa aapc aara aarc aard aare aarp abaa abab abac abad abae abak abap abar abb- abba abbb abbe abbr abca abcb abcc abcd abcp abcr abda abec abed abee aber abpa abpc abpd abpp abpr abra abrc acaa acab acac acad acae acap acar acba acca accc accd acce accp acda acdb acdc acde acdp ace- acea acec aced acek acer ackd acke acpa acpd acpe acpr acr- acra acrc acre acrr adaa adab adac adad adae adak adap adar adba adbc adcc adda addc addd adde addr adea adeb adee ader adp- adra adre aeac aeap aecb aede aeer aeka aer- aera aerc aerd akaa akae akap akar akca aked akee aker akka akr- akra akre apac apak apap apar apba apbr apca apcb apcc apcd apcr apda apdd apea apec aped apep aper apke appa appc appd appr apra aprc apre arab arac arad arae arak arap arar arba arbe arc- arca arce arda ardc arde area arec ared aree arek arep arka arke arpa arpe arr- arra arrc arre arrk arrr baaa baad baak baar baba babb babe babr bac- baca bacc bace back bada badb badd bade badr baed baek baer bak- baka bake bakr bapa bapc bape bapp bar- bara barb barc bard bare bark barr bbad bbbb bbdd bbeb bbpr bbrc bcaa bcap bcar bcbc bcbp bcca bccc bcda bcde bcec bcer bcpp bcra bd-r bdbc bddc bdpc bead beak beap bear beba bebb bebe beca beck beda bede beeb beed beek beep beer beka beke bera berc berd bere berk berr bkpr bpcp bpda bpea bprc bprd brab brac brad brae brak brca brcb brce brda brea breb brec bred bree brek brep brer brka brkb brrr c-cd caaa caab caac caap caba cabe cac- caca cacc cace cack cacr cada cadc cadd cade cadr caec caer caka cake capa capb capc capd cape capp cara carb carc card care cark carp carr cbac cbar cbbc cbca cbcc cbce cbcp cbcr cbdb cbdc cbea cbec cbee cber cbka cbkr cbpc cbpp cbrd cbre ccaa ccab ccac ccad ccap ccar ccba ccbc ccca cccb cccc cccp ccdc ccdp ccdr cced ccee ccpa ccpe ccpp ccpr ccra ccrc ccre ccrp cd-e cd-r cdaa cdac cdad cdba cdda cddb cddr cdec cder cdre ceac cead cear ceba cebp cec- ceca cece cecp ceda cedd cede ceeb ceec ceke cepa cepc cepe cepp cepr cer- cera cerc cerd cere cerp ckac ckbc ckbe ckck cker ckpc ckpr ckrc ckrd cpaa cpac cpad cpap cpbc cpca cpce cpea cpeb cpep cper cppa cppd cpre crab crac crap crar crbc crca crcc crce crcr crda crdc cre- crea creb crec cred cree crep crkc crkp crpc daab daad daae daap daar daba dabb dabp daca dace dada dade