-al a-a a-b a-t aaa aab aal aas aat ab- aba abb abl abs abt al- ala alb all als alt as- asa asb asl ass ast at- ata atb atl ats att baa bab bal bas bat bba bbb bbl bbs bbt bla blb bll bls blt bsa bsb bsl bss bst bta btb btl bts btt la- laa lab lal las lat lba lbb lbl lbs lbt lla llb lll lls llt lsa lsb lsl lss lst lta ltb ltl lts ltt saa sab sal sas sat sba sbb sbl sbs sbt sla slb sll sls slt ss- ssa ssb ssl sss sst sta stb stl sts stt taa tab tal tas tat tba tbb tbl tbs tbt tla tll tls tlt tsa tsb tsl tss tst tta ttb ttl tts ttt