-al a-a a-b aaa aab aal aap aar aas ab- aba abb abl abp abr abs al- ala alb all alp alr als ap- apa apb apl app apr aps ar- ara arb arl arp arr ars as- asa asb asl asp asr ass b-p baa bab bal bap bar bas bba bbb bbl bbp bbr bbs bla blb bll blp blr bls bpa bpb bpl bpp bpr bps bra brb brl brp brr brs bsa bsb bsl bsp bsr bss l-p la- laa lab lal lap lar las lba lbb lbl lbp lbr lbs lla llb lll llp llr lls lpa lpb lpl lpp lpr lps lra lrb lrp lrr lrs lsa lsb lsl lsp lsr lss p-p paa pab pal pap par pas pba pbb pbl pbp pbr pbs pla plb pll plp plr pls ppa ppb ppl ppp ppr pps pra prb prl prp prr prs ps- psa psb psl psp psr pss ra- raa rab ral rap rar ras rba rbb rbl rbp rbr rbs rla rll rlp rlr rls rpa rpb rpl rpp rpr rps rra rrb rrl rrp rrr rrs rsa rsb rsl rsp rsr rss saa sab sal sap sar sas sba sbb sbl sbp sbr sbs sla slb sll slp slr sls spa spb spl spp spr sps sr- sra srb srl srp srr srs ss- ssa ssb ssl ssp ssr sss