-al -er a-a a-b a-c a-t aaa aab aac aae aak aal aan aar aat ab- aba abb abc abe abk abl abn abr abt ac- aca acb acc ace ack acl acn acr act aea aeb aec aee aek ael aen aer aet aka akb akc ake akk akl akn akr al- ala alb alc ale alk all aln alr alt an- ana anb anc ane ank anl ann anr ant ar- ara arb arc are ark arl arn arr art at- ata atb atc ate atl atn atr att baa bab bac bae bak bal ban bar bat bba bbb bbc bbe bbk bbl bbn bbr bbt bca bcb bcc bce bck bcl bcn bcr bct be- bea beb bec bee bek bel ben ber bet bka bkb bkc bke bkk bkl bkn bkr bkt bla blb blc ble blk bll bln blr blt bna bnb bnc bne bnk bnl bnn bnr bnt bra brb bre brk brl brn brr brt bta btb btc bte btk btl btn btr btt c-- caa cab cac cae cak cal can car cat cba cbb cbc cbe cbk cbl cbn cbr cbt cca ccb ccc cce cck ccl ccn ccr cct ce- cea ceb cec cee cek cel cen cer cet cka ckb ckc ckt cl- cla clb clc cle clk cll cln clr clt cn- cna cnb cnc cne cnl cnn cnr cnt cra crb crc cre crk crl crn crr crt cta ctb ctc cte ctk ctl ctn ctr ctt eaa eab eac eae eak eal ean ear eat eba ebb ebc ebe ebk ebl ebn ebr ebt ec- eca ecb ecc ece eck ecl ecn ecr ect eea eeb eec eee eek eel een eer eet eka ekb ekc eke ekl ekr ekt ela elb elc ele elk ell eln elr elt en- ena enb enc ene enk enl enn enr ent era erb erc ere erk erl ern err ert eta etb etc ete etk etl etn etr ett k-t ka- kaa kab kac kae kak kal kan kar kat kba kbb kbc kbe kbk kbl kbn kbr kca kcb kcc kce kck kcl kcn kcr kct ke- kea keb kec kee kek kel ken ker ket kkb kkc kke kkk kkl kkn kkr kkt kl- kla klb klc klr klt kn- kna knc kne knk knl knn knr knt kra krc krk krl krn krr krt kta ktb ktc kte ktk ktl ktn ktr ktt la- laa lab lac lae lak lal lan lar lat lba lbb lbc lbe lbk lbl lbr lbt lca lcb lcc lce lck lcl lcn lcr lct lea leb lec lee lek lel len ler let lka lkb lkl lkr lkt lla llb llc lle llk lll lln llr llt lna lnb lnc lne lnk lnl lnn lnr lnt lra lrb lrc lrk lrn lrr lrt lta ltb ltc lte ltk ltl ltr ltt naa nab nac nae nak nal nan nar nat nba nbb nbc nbe nbk nbl nbn nbr nbt nca ncb ncc nce nck ncl ncn ncr nct ne- nea neb nec nee nek nel nen ner net nka nkc nke nkk nkn nkr nkt nla nlb nlc nle nlk nll nln nlr nlt nna nnb nnc nne nnk nnl nnn nnt nra nrb nrc nre nrk nrl nrn nrr nrt nta ntb ntc nte ntk ntn ntr ntt ra- raa rab rac rae rak ral ran rar rat rba rbb rbc rbe rbk rbl rbn rbr rbt rca rcb rcc rce rcl rcn rcr rct re- rea reb rec ree rek rel ren rer ret rkb rkc rke rkk rkt rla rlc rle rll rln rlr rlt rna rnb rnc rnn rnr rnt rra rrb rrc rrk rrl rrn rrr rrt rta rtb rtc rte rtk rtl rtn rtr rtt taa tab tac tae tak tal tan tar tat tba tbb tbc tbe tbk tbl tbn tbr tbt tca tcb tcc tce tck tcl tcn tcr tct te- tea teb tec tee tek tel ten ter tet tka tkb tkc tke tkk tkl tkr tkt tla tlc tle tlk tll tln tlr tlt tna tnb tnc tne tnk tnl tnn tnr tnt tra trb trc tre trk trl trn trr trt tta ttb ttc tte ttk ttl ttn ttr ttt