a-a a-b a-c aaa aab aac aad aao aap aar ab- aba abb abc abd abo abp abr ac- aca acb acc acd aco acp acr ad- ada adb adc add ado adp adr aoa aob aoc aod aoo aop aor ap- apa apb apc apd apo app apr ar- ara arb arc ard aro arp arr b-p baa bab bac bad bao bap bar bba bbb bbc bbd bbo bbp bbr bca bcb bcc bcd bco bcp bcr bda bdb bdc bdd bdo bdp bdr boa bob boc bod boo bop bor bpa bpb bpc bpd bpo bpp bpr bra brb brd bro brp brr c-- caa cab cac cad cao cap car cba cbb cbc cbd cbo cbp cbr cca ccb ccc ccd cco ccp ccr cda cdb cdc cdd cdo cdp cdr co- coa cob coc cod coo cop cor cpa cpb cpc cpd cpo cpp cpr cra crb crc crd cro crp crr daa dab dac dad dao dap dar dba dbb dbc dbd dbo dbp dbr dca dcb dcc dcd dco dcp dcr dda ddb ddc ddd ddo ddp ddr doa dob doc dod doo dop dor dpa dpb dpc dpd dpo dpp dpr dra drb drc drd dro drp drr oaa oab oac oad oao oap oar ob- oba obb obc obd obo obp obr oc- oca ocb occ ocd oco ocp ocr oda odb odc odd odo odp odr oo- ooa oob ooc ood ooo oop oor op- opa opb opc opd opo opp opr or- ora orb orc ord oro orp orr p-p paa pab pac pad pao pap par pba pbb pbc pbd pbo pbp pbr pca pcb pcc pcd pco pcp pcr pda pdb pdc pdd pdo pdp pdr poa pob poc pod poo pop por ppa ppb ppc ppd ppo ppp ppr pra prb prc prd pro prp prr ra- raa rab rac rad rao rap rar rba rbb rbc rbd rbo rbp rbr rca rcb rcc rcd rco rcp rcr rda rdb rdc rdd rdo rdp rdr roa rob roc rod roo rop ror rpa rpb rpc rpd rpo rpp rpr rra rrb rrc rrd rrp rrr

a-do aaaa aaab aaac aaad aaap aaar aaba aabb aabc aabd aabp aaca aacb aacc aacd aaco aacp aacr aada aadc aaoo aapa aapc aapo aara aarc aard aaro aarp abaa abab abac abad abap abar abb- abba abbb abbo abbr abca abcb abcc abcd abcp abcr abda abdo aboa abob abod aboo abor abpa abpc abpd abpp abpr abra abrc abro acaa acab acac acad acap acar acba acca accc accd acco accp acda acdb acdc acdp acoa acod acop acor acpa acpd acpr acr- acra acrc acro acrr adaa adab adac adad adao adap adar adba adbc adcc adda addc addd addo addr adob adoc adod adoo ador adp- adra adro aoba aoca aopo aora aorb apac apao apap apar apba apbr apca apcb apcc apcd apco apcr apda apdd apo- apoc apod apoo apop apor appa appc appd appr apra aprc apro arab arac arad arap arar arba arc- arca arco arda ardc ardo aroa arob arod aroo aror arpa arr- arra arrc arro arrr baaa baad baar baba babb babo babr bac- baca bacc baco bada badb badd bado badr bapa bapc bapp bar- bara barb barc bard baro barr bbad bbbb bbdd bbdo bbpr bbrc bcaa bcap bcar bcbc bcbp bcca bccc bcda bcor bcpp bcra bd-r bdbc bddc bdpc boab boac boad boar boba bobb bobo boca boco boda bodb bodo boob booc bood boop boor bopa bopp bor- bora bord boro borr bpcp bpda bprc bprd brab brac brad brao brca brcb brda brdo broa brob broc brod broo bror brrr c-bo c-cd caaa caab caac caap caba cabo cac- caca cacc caco cacr cada cadc cadd cado cadr caod caor capa capb capc capd capo capp cara carb carc card caro carp carr cbac cbar cbbc cbca cbcc cbcp cbcr cbdb cbdc cbdo cbpc cbpp cbrd ccaa ccab ccac ccad ccap ccar ccba ccbc ccca cccb cccc cccp ccdc ccdp ccdr ccob ccoc ccod ccpa ccpp ccpr ccra ccrc ccrp cd-r cdaa cdac cdad cdba cdda cddb cddr coad coba cobb cobo coca coco cocp coda codd coob cood coop copa copd copo copp copr cor- cora corb corc cord coro corp corr cpaa cpac cpad cpap cpbc cpca cppa cppd crab crac crap crar crbc crca crcc crcr crda crdc crob croc crod croo crop cror crpc d-bo daab daad daap daar daba dabb dabo dabp daca dada dado dapa dapp dara darb darc dard daro darp darr dbar dbcc dbcp dbpc dbpd dcbc dcca dccb dccc dccp dcdb dcop dcpo dcra dddd ddoc ddpo ddrc doab doap doar doba dobb doca doco dod- doda dodd dodo doob dood doop door dopa dopo dopp dopr dora dorc dord doro dorp dorr dpaa dpac dpbc dpcp dppa dppc draa drab drac drad drap drar drba drbc drca drda drob drod drop drra oara obad obba obbo obor obra obro ocab ocac ocad ocap ocbc occa occc ocpa ocpd ocpp ocra ocro ocrr odac odbo odda oddd odoo odop odor odra odrp ooaa ooba oocr ooda oooo oora oord opap opar opca opo- opor oppa oppo opra orab orac orad orao orar orba orbb orbo orca orco orda ordo oro- oror orpc orra orro paap paar paba paca pacd paco pada padd pado paoc papa papb papp papr par- para parc pard paro parp parr pbac pbar pbcc pboc pbpa pcaa pcad pcap pcba pcbc pcca pccc pcoa pcod pcpb pcpp pcra pcrc pcrd pdac pdca pdcp pdoc pdpa pdpr pdrc poad poar poba pobo poca pocd poco pod- poda podd podo pood poop poor pop- popa popc popo popp pora porb porc poro porr ppac ppad ppap ppar ppcc ppcd ppoa ppod pppa pppd pppo pppp pprc prad prao prar prbc prca prcc prcd prcp pro- proa prob proc prod proo prop prpd prrd raab raad raba rabb rabo rac- raca racc raco