-al -ol a-a a-b a-c a-t aaa aab aac aae aal aao aas aat ab- aba abb abc abe abl abo abs abt ac- aca acb acc ace acl aco acs act aea aeb aec aee ael aeo aes aet al- ala alb alc ale all alo als alt aoa aob aoc aoe aol aoo aos aot as- asa asb asc ase asl aso ass ast at- ata atb atc ate atl ato ats att baa bab bac bae bal bao bas bat bba bbb bbc bbe bbl bbo bbs bbt bca bcb bcc bce bcl bco bcs bct be- bea beb bec bee bel beo bes bet bla blb blc ble bll blo bls blt boa bob boc boe bol boo bos bot bsa bsb bsc bse bsl bso bss bst bta btb btc bte btl bto bts btt c-- caa cab cac cae cal cao cas cat cba cbb cbc cbe cbl cbo cbs cbt cca ccb ccc cce ccl cco ccs cct ce- cea ceb cec cee cel ceo ces cet cl- cla clb clc cle cll clo cls clt co- coa cob coc coe col coo cos cot csa csb csc cse csl cso css cst cta ctb ctc cte ctl cto cts ctt eaa eab eac eae eal eao eas eat eba ebb ebc ebe ebl ebo ebs ebt ec- eca ecb ecc ece ecl eco ecs ect eea eeb eec eee eel eeo ees eet ela elb elc ele ell elo els elt eo- eoa eob eoc eoe eol eoo eos eot es- esa esb esc ese esl eso ess est eta etb etc ete etl eto ets ett la- laa lab lac lae lal lao las lat lba lbb lbc lbe lbl lbo lbs lbt lca lcb lcc lce lcl lco lcs lct lea leb lec lee lel leo les let lla llb llc lle lll llo lls llt loa lob loc loe lol loo los lot lsa lsb lsc lse lsl lso lss lst lta ltb ltc lte ltl lto lts ltt oaa oab oac oae oal oao oas oat ob- oba obb obc obe obl obo obs obt oc- oca ocb occ ocl oco ocs oct oea oeb oec oee oel oeo oes oet ola olb olc ole oll olo ols olt oo- ooa oob ooc ool ooo oos oot os- osa osb osc ose osl oso oss ost ot- ota otb otc ote otl oto ots ott saa sab sac sae sal sao sas sat sba sbb sbc sbe sbl sbo sbs sbt sca scb scc sce scl sco scs sct se- sea seb sec see sel seo ses set sla slb slc sle sll slo sls slt soa sob soc soe sol soo sos sot ss- ssa ssb ssc sse ssl sso sss sst sta stb stc ste stl sto sts stt taa tab tac tae tal tao tas tat tba tbb tbc tbe tbl tbo tbs tbt tca tcb tcc tce tcl tco tcs tct te- tea teb tec tee tel teo tes tet tla tlc tle tll tlo tls tlt to- toa tob toc toe tol too tos tot tsa tsb tsc tse tsl tso tss tst tta ttb ttc tte ttl tto tts ttt