-er a-a a-b a-c aaa aab aac aae aah aak aan aap aar ab- aba abb abc abe abh abk abn abp abr ac- aca acb acc ace ach ack acn acp acr aea aeb aec aee aeh aek aen aep aer aha ahb ahc ahe ahh ahk ahn ahp ahr aka akb akc ake akh akk akn akp akr an- ana anb anc ane anh ank ann anp anr ap- apa apb apc ape aph apk apn app apr ar- ara arb arc are arh ark arn arp arr b-p baa bab bac bae bah bak ban bap bar bba bbb bbc bbe bbh bbk bbn bbp bbr bca bcb bcc bce bch bck bcn bcp bcr be- bea beb bec bee beh bek ben bep ber bha bhb bhc bhe bhh bhk bhp bhr bka bkb bkc bke bkk bkn bkp bkr bna bnb bnc bne bnk bnn bnp bnr bpa bpb bpc bpe bph bpn bpp bpr bra brb bre brh brk brn brp brr c-- caa cab cac cae cah cak can cap car cba cbb cbc cbe cbh cbk cbn cbp cbr cca ccb ccc cce cch cck ccn ccp ccr ce- cea ceb cec cee ceh cek cen cep cer ch- cha chb chc che chh chk chn chp chr cka ckb ckc ckh cn- cna cnb cnc cne cnh cnn cnp cnr cpa cpb cpc cpe cph cpk cpn cpp cpr cra crb crc cre crh crk crn crp crr eaa eab eac eae eah eak ean eap ear eba ebb ebc ebe ebh ebk ebn ebp ebr ec- eca ecb ecc ece ech eck ecn ecr eea eeb eec eee eek een eep eer eha ehb ehc ehe ehh ehn ehp ehr eka ekb ekc eke ekh ekp ekr en- ena enb enc ene enh enk enn enp enr ep- epa epb epc epe eph epn epp epr era erb erc ere erh erk ern erp err haa hab hac hae hah hak han hap har hba hbb hbc hbe hbh hbk hbn hbp hbr hca hcb hcc hce hch hck hcn hcp hcr he- hea heb hec hee heh hek hen hep her hha hhb hhc hhe hhh hhk hhn hhp hhr hka hkb hkh hkk hkn hkp hkr hna hnb hnc hne hnh hnk hnn hpa hpb hpc hpe hph hpk hpn hpp hpr hr- hra hrb hrc hre hrh hrk hrn hrp hrr ka- kaa kab kac kae kah kak kan kap kar kba kbb kbc kbe kbh kbk kbn kbp kbr kca kcb kcc kce kch kck kcn kcp kcr ke- kea keb kec kee keh kek ken kep ker kha khe khh khk khn khr kkb kkc kke kkh kkk kkn kkp kkr kn- kna knc kne knk knn knp knr kpa kpc kpe kph kpk kpn kpp kpr kra krc krk krn krp krr naa nab nac nae nah nak nan nap nar nba nbb nbc nbe nbk nbn nbp nbr nca ncb ncc nce nch nck ncn ncp ncr ne- nea neb nec nee neh nek nen nep ner nha nhb nhc nhe nhh nhk nhn nhp nhr nka nkc nke nkk nkn nkp nkr nna nnb nnc nne nnh nnk nnn nnp npa npb npc npe nph npn npp npr nra nrb nrc nre nrk nrn nrp nrr p-p paa pab pac pae pah pak pan pap par pba pbb pbc pbe pbk pbn pbp pbr pca pcb pcc pce pch pck pcn pcp pcr pea peb pec pee peh pek pen pep per pha phb phc phe phk phn php phr pka pkb pkc pke pkn pkp pkr pn- pna pnb pnc pne pnh pnk pnn pnp pnr ppa ppb ppc ppe pph ppk ppn ppp ppr pra prb prc pre prh prk prn prp prr ra- raa rab rac rae rah rak ran rap rar rba rbb rbc rbe rbh rbk rbn rbp rbr rca rcb rcc rce rch rcn rcp rcr re- rea reb rec ree reh rek ren rep rer rh- rha rhb rhc rhe rhh rhn rhp rhr rkb rkc rke rkk rkp rna rnb rnc rnh rnn rnp rnr rpa rpb rpc rpe rph rpk rpn rpp rpr rra rrb rrc rrh rrk rrn rrp rrr