a-a aaa aaf aao aap aar aav af- afa aff afo afp afr afv aoa aof aoo aop aor aov ap- apa apf apo app apr apv ar- ara arf aro arp arr arv av- ava avf avo avp avr faa faf fao fap far fav ffa fff ffo ffp ffr ffv foa fof foo fop for fpa fpo fpp fpr fpv fra frf fro frp frr fva fvp oaa oaf oao oap oar oav of- ofa off ofo ofp ofr ofv oo- ooa oof ooo oop oor oov op- opa opf opo opp opr opv or- ora orf oro orp orr orv ov- ova ovf ovo ovp ovv p-p paa paf pao pap par pav pfa pff pfo pfp pfr pfv poa pof poo pop por pov ppa ppf ppo ppp ppr ppv pra prf pro prp prr prv pva pvf pvo pvp pvr pvv ra- raa raf rao rap rar rav rfa rff rfo rfp rfr rfv roa rof roo rop ror rov rpa rpf rpo rpp rpr rpv rra rrf rrp rrr rva rvf rvo rvp rvr rvv v-a vaa vao vap var vav vfa vff vfp vfr vfv voa vof voo vop vor vov vpa vpf vpo vpp vpr vra vrf vrp vrr vva vvo vvr vvv