-al -ol a-a a-b a-c a-t aaa aab aac aal aao aar aas aat ab- aba abb abc abl abo abr abs abt ac- aca acb acc acl aco acr acs act al- ala alb alc all alo alr als alt aoa aob aoc aol aoo aor aos aot ar- ara arb arc arl aro arr ars art as- asa asb asc asl aso asr ass ast at- ata atb atc atl ato atr ats att baa bab bac bal bao bar bas bat bba bbb bbc bbl bbo bbr bbs bbt bca bcb bcc bcl bco bcr bcs bct bla blb blc bll blo blr bls blt boa bob boc bol boo bor bos bot bra brb brl bro brr brs brt bsa bsb bsc bsl bso bsr bss bst bta btb btc btl bto btr bts btt c-- caa cab cac cal cao car cas cat cba cbb cbc cbl cbo cbr cbs cbt cca ccb ccc ccl cco ccr ccs cct cl- cla clb clc cll clo clr cls clt co- coa cob coc col coo cor cos cot cra crb crc crl cro crr crs crt csa csb csc csl cso csr css cst cta ctb ctc ctl cto ctr cts ctt la- laa lab lac lal lao lar las lat lba lbb lbc lbl lbo lbr lbs lbt lca lcb lcc lcl lco lcr lcs lct lla llb llc lll llo llr lls llt loa lob loc lol loo lor los lot lra lrb lrc lro lrr lrs lrt lsa lsb lsc lsl lso lsr lss lst lta ltb ltc ltl lto ltr lts ltt oaa oab oac oal oao oar oas oat ob- oba obb obc obl obo obr obs obt oc- oca ocb occ ocl oco ocr ocs oct ola olb olc oll olo ols olt oo- ooa oob ooc ool ooo oor oos oot or- ora orb orc orl oro orr ors ort os- osa osb osc osl oso osr oss ost ot- ota otb otc otl oto otr ots ott ra- raa rab rac ral rao rar ras rat rba rbb rbc rbl rbo rbr rbs rbt rca rcb rcc rcl rco rcr rcs rct rla rlc rll rlo rlr rls rlt roa rob roc rol roo ror ros rot rra rrb rrc rrl rrr rrs rrt rsa rsb rsc rsl rso rsr rss rst rta rtb rtc rtl rto rtr rts rtt saa sab sac sal sao sar sas sat sba sbb sbc sbl sbo sbr sbs sbt sca scb scc scl sco scr scs sct sla slb slc sll slo slr sls slt soa sob soc sol soo sor sos sot sr- sra srb src srl sro srr srs srt ss- ssa ssb ssc ssl sso ssr sss sst sta stb stc stl sto str sts stt taa tab tac tal tao tar tas tat tba tbb tbc tbl tbo tbr tbs tbt tca tcb tcc tcl tco tcr tcs tct tla tlc tll tlo tlr tls tlt to- toa tob toc tol too tor tos tot tra trb trc trl tro trr trs trt tsa tsb tsc tsl tso tsr tss tst tta ttb ttc ttl tto ttr tts ttt