-al -ol a-a a-b aaa aab aal aao aap aar ab- aba abb abl abo abp abr al- ala alb all alo alp alr aoa aob aol aoo aop aor ap- apa apb apl apo app apr ar- ara arb arl aro arp arr b-p baa bab bal bao bap bar bba bbb bbl bbo bbp bbr bla blb bll blo blp blr boa bob bol boo bop bor bpa bpb bpl bpo bpp bpr bra brb brl bro brp brr l-p la- laa lab lal lao lap lar lba lbb lbl lbo lbp lbr lla llb lll llo llp llr loa lob lol loo lop lor lpa lpb lpl lpo lpp lpr lra lrb lro lrp lrr oaa oab oal oao oap oar ob- oba obb obl obo obp obr ola olb oll olo olp oo- ooa oob ool ooo oop oor op- opa opb opl opo opp opr or- ora orb orl oro orp orr p-p paa pab pal pao pap par pba pbb pbl pbo pbp pbr pla plb pll plo plp plr poa pob pol poo pop por ppa ppb ppl ppo ppp ppr pra prb prl pro prp prr ra- raa rab ral rao rap rar rba rbb rbl rbo rbp rbr rla rll rlo rlp rlr roa rob rol roo rop ror rpa rpb rpl rpo rpp rpr rra rrb rrl rrp rrr