-al -ol a-a a-b a-c a-t aaa aab aac aal aao aas aat ab- aba abb abc abl abo abs abt ac- aca acb acc acl aco acs act al- ala alb alc all alo als alt aoa aob aoc aol aoo aos aot as- asa asb asc asl aso ass ast at- ata atb atc atl ato ats att baa bab bac bal bao bas bat bba bbb bbc bbl bbo bbs bbt bca bcb bcc bcl bco bcs bct bla blb blc bll blo bls blt boa bob boc bol boo bos bot bsa bsb bsc bsl bso bss bst bta btb btc btl bto bts btt c-- caa cab cac cal cao cas cat cba cbb cbc cbl cbo cbs cbt cca ccb ccc ccl cco ccs cct cl- cla clb clc cll clo cls clt co- coa cob coc col coo cos cot csa csb csc csl cso css cst cta ctb ctc ctl cto cts ctt la- laa lab lac lal lao las lat lba lbb lbc lbl lbo lbs lbt lca lcb lcc lcl lco lcs lct lla llb llc lll llo lls llt loa lob loc lol loo los lot lsa lsb lsc lsl lso lss lst lta ltb ltc ltl lto lts ltt oaa oab oac oal oao oas oat ob- oba obb obc obl obo obs obt oc- oca ocb occ ocl oco ocs oct ola olb olc oll olo ols olt oo- ooa oob ooc ool ooo oos oot os- osa osb osc osl oso oss ost ot- ota otb otc otl oto ots ott saa sab sac sal sao sas sat sba sbb sbc sbl sbo sbs sbt sca scb scc scl sco scs sct sla slb slc sll slo sls slt soa sob soc sol soo sos sot ss- ssa ssb ssc ssl sso sss sst sta stb stc stl sto sts stt taa tab tac tal tao tas tat tba tbb tbc tbl tbo tbs tbt tca tcb tcc tcl tco tcs tct tla tlc tll tlo tls tlt to- toa tob toc tol too tos tot tsa tsb tsc tsl tso tss tst tta ttb ttc ttl tto tts ttt