a-a a-b aaa aab aad aao aap aar aav ab- aba abb abd abo abp abr abv ad- ada adb add ado adp adr adv aoa aob aod aoo aop aor aov ap- apa apb apd apo app apr apv ar- ara arb ard aro arp arr arv av- ava avb avd avo avp avr b-p baa bab bad bao bap bar bav bba bbb bbd bbo bbp bbr bda bdb bdd bdo bdp bdr bdv boa bob bod boo bop bor bov bpa bpb bpd bpo bpp bpr bpv bra brb brd bro brp brr brv bva bvb bvd bvo bvp bvr bvv daa dab dad dao dap dar dav dba dbb dbd dbo dbp dbr dbv dda ddb ddd ddo ddp ddr doa dob dod doo dop dor dov dpa dpb dpd dpo dpp dpr dpv dra drb drd dro drp drr drv dva dvb dvd dvp dvr oaa oab oad oao oap oar oav ob- oba obb obd obo obp obr obv oda odb odd odo odp odr odv oo- ooa oob ood ooo oop oor oov op- opa opb opd opo opp opr opv or- ora orb ord oro orp orr orv ov- ova ovb ovd ovo ovp ovv p-p paa pab pad pao pap par pav pba pbb pbd pbo pbp pbr pda pdb pdd pdo pdp pdr pdv poa pob pod poo pop por pov ppa ppb ppd ppo ppp ppr ppv pra prb prd pro prp prr prv pva pvb pvd pvo pvp pvr pvv ra- raa rab rad rao rap rar rav rba rbb rbd rbo rbp rbr rda rdb rdd rdo rdp rdr rdv roa rob rod roo rop ror rov rpa rpb rpd rpo rpp rpr rpv rra rrb rrd rrp rrr rva rvb rvd rvo rvp rvr rvv v-a vaa vab vad vao vap var vav vba vbd vbo vbr vbv vdb vdd vdo vdp vdr vdv voa vob vod voo vop vor vov vpa vpb vpd vpo vpp vpr vra vrb vrd vrp vrr vva vvb vvo vvr vvv