-er a-a a-b a-z aaa aab aae aan aap aar aaz ab- aba abb abe abn abp abr abz aea aeb aee aen aep aer aez an- ana anb ane ann anp anr anz ap- apa apb ape apn app apr ar- ara arb are arn arp arr arz az- aza azb aze azn azp azz b-p baa bab bae ban bap bar baz bba bbb bbe bbn bbp bbr be- bea beb bee ben bep ber bez bna bnb bne bnn bnp bnr bnz bpa bpb bpe bpn bpp bpr bra brb bre brn brp brr brz bza bze bzn bzp bzr bzz eaa eab eae ean eap ear eaz eba ebb ebe ebn ebp ebr eea eeb eee een eep eer en- ena enb ene enn enp enr enz ep- epa epb epe epn epp epr epz era erb ere ern erp err erz eze ezr ezz naa nab nae nan nap nar naz nba nbb nbe nbn nbp nbr ne- nea neb nee nen nep ner nez nna nnb nne nnn nnp nnz npa npb npe npn npp npr npz nra nrb nre nrn nrp nrr nrz nzb nze nzp nzz p-p paa pab pae pan pap par paz pba pbb pbe pbn pbp pbr pbz pea peb pee pen pep per pez pn- pna pnb pne pnn pnp pnr ppa ppb ppe ppn ppp ppr ppz pra prb pre prn prp prr prz pzp ra- raa rab rae ran rap rar raz rba rbb rbe rbn rbp rbr re- rea reb ree ren rep rer rez rna rnb rnn rnp rnr rnz rpa rpb rpe rpn rpp rpr rpz rra rrb rrn rrp rrr rza rzb rze zaa zab zan zap zar zaz zbb zbr zea zeb zee zen zep zer zez zne znn znp zpe zpp zpr zrp zzr zzz