-er a-a a-b aaa aab aae aaf aah aan aao aap aar ab- aba abb abe abf abh abn abo abp abr aea aeb aee aef aeh aen aeo aep aer af- afa afb afe aff afh afn afo afp afr aha ahb ahe ahf ahh ahn aho ahp ahr an- ana anb ane anf anh ann ano anp anr aoa aob aoe aof aoh aon aoo aop aor ap- apa apb ape apf aph apn apo app apr ar- ara arb are arf arh arn aro arp arr b-p baa bab bae baf bah ban bao bap bar bba bbb bbe bbf bbh bbn bbo bbp bbr be- bea beb bee bef beh ben beo bep ber bfa bfb bfe bff bfh bfn bfo bfp bfr bha bhb bhe bhf bhh bho bhp bhr bna bnb bne bnf bnn bno bnp bnr boa bob boe bof boh bon boo bop bor bpa bpb bpe bpf bph bpn bpo bpp bpr bra brb bre brf brh brn bro brp brr eaa eab eae eaf eah ean eao eap ear eba ebb ebe ebf ebh ebn ebo ebp ebr eea eeb eee eef een eeo eep eer ef- efa efb efe eff efh efo efp efr eha ehb ehe ehf ehh ehn eho ehp ehr en- ena enb ene enf enh enn eno enp enr eo- eoa eob eoe eof eoh eon eoo eop eor ep- epa epb epe epf eph epn epo epp epr era erb ere erf erh ern ero erp err faa fab fae faf fah fan fao fap far fba fbb fbe fbf fbh fbn fbo fbp fbr fea feb fee fef feh fen feo fep fer ffa ffe fff ffh ffn ffo ffp ffr fha fhb fhe fhf fhh fhn fho fhp fhr fna fnb fne fnf fnh fnn fnp fnr foa fob foe fof foh fon foo fop for fpa fpb fpe fph fpn fpo fpp fpr fra frb fre frf frh frn fro frp frr haa hab hae haf hah han hao hap har hba hbb hbe hbf hbh hbn hbo hbp hbr he- hea heb hee hef heh hen heo hep her hfa hfb hfe hff hfh hfn hfo hfp hfr hha hhb hhe hhf hhh hhn hho hhp hhr hna hnb hne hnf hnh hnn hno hoa hob hoe hof hoh hon hoo hop hor hpa hpb hpe hpf hph hpn hpo hpp hpr hr- hra hrb hre hrf hrh hrn hro hrp hrr naa nab nae naf nah nan nao nap nar nba nbb nbe nbf nbn nbo nbp nbr ne- nea neb nee nef neh nen neo nep ner nfa nfb nfe nff nfn nfo nfp nfr nha nhb nhe nhf nhh nhn nhp nhr nna nnb nne nnf nnh nnn nno nnp no- noa nob noe nof noh non noo nop nor npa npb npe npf nph npn npo npp npr nra nrb nre nrf nrn nro nrp nrr oaa oab oae oaf oah oan oao oap oar ob- oba obb obe obf obh obn obo obp obr oea oeb oee oef oeh oen oeo oep oer of- ofa ofb ofe off ofn ofo ofp ofr oha ohe ohf ohh ohn oho ohp ohr on- ona onb one onf onh onn ono onp onr oo- ooa oob oof ooh oon ooo oop oor op- opa opb ope opf oph opn opo opp opr or- ora orb ore orf orh orn oro orp orr p-p paa pab pae paf pah pan pao pap par pba pbb pbe pbf pbn pbo pbp pbr pea peb pee pef peh pen peo pep per pfa pfb pfe pff pfn pfo pfp pfr pha phb phe phf phn pho php phr pn- pna pnb pne pnf pnh pnn pno pnp pnr poa pob poe pof poh pon poo pop por ppa ppb ppe ppf pph ppn ppo ppp ppr pra prb pre prf prh prn pro prp prr ra- raa rab rae raf rah ran rao rap rar rba rbb rbe rbf rbh rbn rbo rbp rbr re- rea reb ree ref reh ren reo rep rer rfa rfb rfe rff rfh rfn rfo rfp rfr rh- rha rhb rhe rhf rhh rhn rho rhp rhr rna rnb rnh rnn rno rnp rnr roa rob roe rof roh ron roo rop ror rpa rpb rpe rpf rph rpn rpo rpp rpr rra rrb rrf rrh rrn rrp rrr