-er a-a a-b a-c aaa aab aac aae aag aah aak aan aar ab- aba abb abc abe abg abh abk abn abr ac- aca acb acc ace acg ach ack acn acr aea aeb aec aee aeg aeh aek aen aer ag- aga agb agc age agg agh agk agn agr aha ahb ahc ahe ahg ahh ahk ahn ahr aka akb akc ake akg akh akk akn akr an- ana anb anc ane ang anh ank ann anr ar- ara arb arc are arg arh ark arn arr baa bab bac bae bag bah bak ban bar bba bbb bbc bbe bbg bbh bbk bbn bbr bca bcb bcc bce bcg bch bck bcn bcr be- bea beb bec bee beg beh bek ben ber bga bgb bgc bge bgg bgh bgk bgn bgr bha bhb bhc bhe bhg bhh bhk bhr bka bkb bkc bke bkg bkk bkn bkr bna bnb bnc bne bng bnk bnn bnr bra brb bre brg brh brk brn brr c-- caa cab cac cae cag cah cak can car cba cbb cbc cbe cbg cbh cbk cbn cbr cca ccb ccc cce ccg cch cck ccn ccr ce- cea ceb cec cee ceg ceh cek cen cer cga cgb cgc cge cgg cgh cgn cgr ch- cha chb chc che chg chh chk chn chr cka ckb ckc ckh cn- cna cnb cnc cne cng cnh cnn cnr cra crb crc cre crg crh crk crn crr eaa eab eac eae eag eah eak ean ear eba ebb ebc ebe ebg ebh ebk ebn ebr ec- eca ecb ecc ece ecg ech eck ecn ecr eea eeb eec eee eeg eek een eer ega egb egc ege egg egh egn egr eha ehb ehc ehe ehg ehh ehn ehr eka ekb ekc eke ekg ekh ekr en- ena enb enc ene eng enh enk enn enr era erb erc ere erg erh erk ern err gaa gab gac gae gag gah gak gan gar gba gbc gbe gbg gbh gbk gbn gbr gca gcb gcc gce gcg gch gck gcn gcr ge- gea geb gec gee geg geh gek gen ger gga ggb ggc ggg ggh ggn ggr gha ghb ghc ghe ghg ghh ghn ghr gka gkb gkh gkn gna gnb gnc gne gnn gnr gra grb grc gre grg grh grk grn grr haa hab hac hae hag hah hak han har hba hbb hbc hbe hbg hbh hbk hbn hbr hca hcb hcc hce hcg hch hck hcn hcr he- hea heb hec hee heg heh hek hen her hga hgb hgc hge hgg hgh hgk hgn hgr hha hhb hhc hhe hhg hhh hhk hhn hhr hka hkb hkg hkh hkk hkn hkr hna hnb hnc hne hng hnh hnk hnn hr- hra hrb hrc hre hrg hrh hrk hrn hrr ka- kaa kab kac kae kag kah kak kan kar kba kbb kbc kbe kbh kbk kbn kbr kca kcb kcc kce kcg kch kck kcn kcr ke- kea keb kec kee keg keh kek ken ker kga kgb kgc kgh kha khe khh khk khn khr kkb kkc kke kkh kkk kkn kkr kn- kna knc kne kng knk knn knr kra krc krg krk krn krr naa nab nac nae nag nah nak nan nar nba nbb nbc nbe nbg nbk nbn nbr nca ncb ncc nce ncg nch nck ncn ncr ne- nea neb nec nee neg neh nek nen ner nga ngb ngc nge ngg ngh ngk ngn nha nhb nhc nhe nhg nhh nhk nhn nhr nka nkc nke nkk nkn nkr nna nnb nnc nne nng nnh nnk nnn nra nrb nrc nre nrg nrk nrn nrr ra- raa rab rac rae rag rah rak ran rar rba rbb rbc rbe rbg rbh rbk rbn rbr rca rcb rcc rce rcg rch rcn rcr re- rea reb rec ree reg reh rek ren rer rga rgb rgc rge rgg rgh rgk rgn rgr rh- rha rhb rhc rhe rhg rhh rhn rhr rkb rkc rke rkg rkk rna rnb rnc rng rnh rnn rnr rra rrb rrc rrg rrh rrk rrn rrr