-al a-a a-b a-c a-t aaa aab aac aal aan aar aas aat ab- aba abb abc abl abn abr abs abt ac- aca acb acc acl acn acr acs act al- ala alb alc all aln alr als alt an- ana anb anc anl ann anr ans ant ar- ara arb arc arl arn arr ars art as- asa asb asc asl asn asr ass ast at- ata atb atc atl atn atr ats att baa bab bac bal ban bar bas bat bba bbb bbc bbl bbn bbr bbs bbt bca bcb bcc bcl bcn bcr bcs bct bla blb blc bll bln blr bls blt bna bnb bnc bnl bnn bnr bns bnt bra brb brl brn brr brs brt bsa bsb bsc bsl bsn bsr bss bst bta btb btc btl btn btr bts btt c-- caa cab cac cal can car cas cat cba cbb cbc cbl cbn cbr cbs cbt cca ccb ccc ccl ccn ccr ccs cct cl- cla clb clc cll cln clr cls clt cn- cna cnb cnc cnl cnn cnr cns cnt cra crb crc crl crn crr crs crt csa csb csc csl csn csr css cst cta ctb ctc ctl ctn ctr cts ctt la- laa lab lac lal lan lar las lat lba lbb lbc lbl lbr lbs lbt lca lcb lcc lcl lcn lcr lcs lct lla llb llc lll lln llr lls llt lna lnb lnc lnl lnn lnr lns lnt lra lrb lrc lrn lrr lrs lrt lsa lsb lsc lsl lsn lsr lss lst lta ltb ltc ltl ltr lts ltt naa nab nac nal nan nar nas nat nba nbb nbc nbl nbn nbr nbs nbt nca ncb ncc ncl ncn ncr ncs nct nla nlb nlc nll nln nlr nls nlt nna nnb nnc nnl nnn nns nnt nra nrb nrc nrl nrn nrr nrs nrt nsa nsb nsc nsl nsn nsr nss nst nta ntb ntc ntn ntr nts ntt ra- raa rab rac ral ran rar ras rat rba rbb rbc rbl rbn rbr rbs rbt rca rcb rcc rcl rcn rcr rcs rct rla rlc rll rln rlr rls rlt rna rnb rnc rnn rnr rns rnt rra rrb rrc rrl rrn rrr rrs rrt rsa rsb rsc rsl rsn rsr rss rst rta rtb rtc rtl rtn rtr rts rtt saa sab sac sal san sar sas sat sba sbb sbc sbl sbn sbr sbs sbt sca scb scc scl scn scr scs sct sla slb slc sll sln slr sls slt sna snb snc snl snn snr sns snt sr- sra srb src srl srn srr srs srt ss- ssa ssb ssc ssl ssn ssr sss sst sta stb stc stl stn str sts stt taa tab tac tal tan tar tas tat tba tbb tbc tbl tbn tbr tbs tbt tca tcb tcc tcl tcn tcr tcs tct tla tlc tll tln tlr tls tlt tna tnb tnc tnl tnn tnr tns tnt tra trb trc trl trn trr trs trt tsa tsb tsc tsl tsn tsr tss tst tta ttb ttc ttl ttn ttr tts ttt