-al -ol a-a a-b a-c a-t aaa aab aac aad aal aao aas aat ab- aba abb abc abd abl abo abs abt ac- aca acb acc acd acl aco acs act ad- ada adb adc add adl ado ads adt al- ala alb alc ald all alo als alt aoa aob aoc aod aol aoo aos aot as- asa asb asc asd asl aso ass ast at- ata atb atc atd atl ato ats att baa bab bac bad bal bao bas bat bba bbb bbc bbd bbl bbo bbs bbt bca bcb bcc bcd bcl bco bcs bct bda bdb bdc bdd bdl bdo bds bdt bla blb blc bld bll blo bls blt boa bob boc bod bol boo bos bot bsa bsb bsc bsd bsl bso bss bst bta btb btc btd btl bto bts btt c-- caa cab cac cad cal cao cas cat cba cbb cbc cbd cbl cbo cbs cbt cca ccb ccc ccd ccl cco ccs cct cda cdb cdc cdd cdl cdo cds cdt cl- cla clb clc cld cll clo cls clt co- coa cob coc cod col coo cos cot csa csb csc csd csl cso css cst cta ctb ctc ctd ctl cto cts ctt daa dab dac dad dal dao das dat dba dbb dbc dbd dbl dbo dbs dbt dca dcb dcc dcd dcl dco dcs dct dda ddb ddc ddd ddl ddo dds ddt dl- dla dlb dlc dld dll dlo dls dlt doa dob doc dod dol doo dos dot dsa dsb dsc dsd dsl dso dss dst dta dtb dtc dtd dtl dto dts dtt la- laa lab lac lad lal lao las lat lba lbb lbc lbd lbl lbo lbs lbt lca lcb lcc lcd lcl lco lcs lct lda ldb ldc ldd ldl ldo lds ldt lla llb llc lld lll llo lls llt loa lob loc lod lol loo los lot lsa lsb lsc lsd lsl lso lss lst lta ltb ltc ltd ltl lto lts ltt oaa oab oac oad oal oao oas oat ob- oba obb obc obd obl obo obs obt oc- oca ocb occ ocd ocl oco ocs oct oda odb odc odd odl odo ods odt ola olb olc old oll olo ols olt oo- ooa oob ooc ood ool ooo oos oot os- osa osb osc osd osl oso oss ost ot- ota otb otc otd otl oto ots ott saa sab sac sad sal sao sas sat sba sbb sbc sbd sbl sbo sbs sbt sca scb scc scd scl sco scs sct sda sdb sdc sdd sdl sdo sds sdt sla slb slc sld sll slo sls slt soa sob soc sod sol soo sos sot ss- ssa ssb ssc ssd ssl sso sss sst sta stb stc std stl sto sts stt taa tab tac tad tal tao tas tat tba tbb tbc tbd tbl tbo tbs tbt tca tcb tcc tcd tcl tco tcs tct tda tdb tdc tdd tdl tdo tds tdt tla tlc tld tll tlo tls tlt to- toa tob toc tod tol too tos tot tsa tsb tsc tsd tsl tso tss tst tta ttb ttc ttd ttl tto tts ttt