-al a-a a-b aaa aab aal aar aas ab- aba abb abl abr abs al- ala alb all alr als ar- ara arb arl arr ars as- asa asb asl asr ass baa bab bal bar bas bba bbb bbl bbr bbs bla blb bll blr bls bra brb brl brr brs bsa bsb bsl bsr bss la- laa lab lal lar las lba lbb lbl lbr lbs lla llb lll llr lls lra lrb lrr lrs lsa lsb lsl lsr lss ra- raa rab ral rar ras rba rbb rbl rbr rbs rla rll rlr rls rra rrb rrl rrr rrs rsa rsb rsl rsr rss saa sab sal sar sas sba sbb sbl sbr sbs sla slb sll slr sls sr- sra srb srl srr srs ss- ssa ssb ssl ssr sss