-al -ol a-a a-b a-t aaa aab aal aao aas aat ab- aba abb abl abo abs abt al- ala alb all alo als alt aoa aob aol aoo aos aot as- asa asb asl aso ass ast at- ata atb atl ato ats att baa bab bal bao bas bat bba bbb bbl bbo bbs bbt bla blb bll blo bls blt boa bob bol boo bos bot bsa bsb bsl bso bss bst bta btb btl bto bts btt la- laa lab lal lao las lat lba lbb lbl lbo lbs lbt lla llb lll llo lls llt loa lob lol loo los lot lsa lsb lsl lso lss lst lta ltb ltl lto lts ltt oaa oab oal oao oas oat ob- oba obb obl obo obs obt ola olb oll olo ols olt oo- ooa oob ool ooo oos oot os- osa osb osl oso oss ost ot- ota otb otl oto ots ott saa sab sal sao sas sat sba sbb sbl sbo sbs sbt sla slb sll slo sls slt soa sob sol soo sos sot ss- ssa ssb ssl sso sss sst sta stb stl sto sts stt taa tab tal tao tas tat tba tbb tbl tbo tbs tbt tla tll tlo tls tlt to- toa tob tol too tos tot tsa tsb tsl tso tss tst tta ttb ttl tto tts ttt