-al a-a a-b aaa aab aal aap aar ab- aba abb abl abp abr al- ala alb all alp alr ap- apa apb apl app apr ar- ara arb arl arp arr b-p baa bab bal bap bar bba bbb bbl bbp bbr bla blb bll blp blr bpa bpb bpl bpp bpr bra brb brl brp brr l-p la- laa lab lal lap lar lba lbb lbl lbp lbr lla llb lll llp llr lpa lpb lpl lpp lpr lra lrb lrp lrr p-p paa pab pal pap par pba pbb pbl pbp pbr pla plb pll plp plr ppa ppb ppl ppp ppr pra prb prl prp prr ra- raa rab ral rap rar rba rbb rbl rbp rbr rla rll rlp rlr rpa rpb rpl rpp rpr rra rrb rrl rrp rrr