-al -ol a-a a-b aaa aab aaf aal aao aar aav ab- aba abb abf abl abo abr abv af- afa afb aff afl afo afr afv al- ala alb alf all alo alr alv aoa aob aof aol aoo aor aov ar- ara arb arf arl aro arr arv av- ava avb avf avl avo avr baa bab baf bal bao bar bav bba bbb bbf bbl bbo bbr bfa bfb bff bfl bfo bfr bfv bla blb blf bll blo blr blv boa bob bof bol boo bor bov bra brb brf brl bro brr brv bva bvb bvl bvo bvr bvv faa fab faf fal fao far fav fba fbb fbf fbl fbo fbr ffa fff ffl ffo ffr ffv fla flb flf fll flo flr foa fob fof fol foo for fra frb frf frl fro frr fva la- laa lab laf lal lao lar lav lba lbb lbf lbl lbo lbr lbv lfa lfb lff lfl lfo lfr lla llb llf lll llo llr llv loa lob lof lol loo lor lov lra lrb lrf lro lrr lrv lva lvb lvf lvl lvr lvv oaa oab oaf oal oao oar oav ob- oba obb obf obl obo obr obv of- ofa ofb off ofl ofo ofr ofv ola olb olf oll olo oo- ooa oob oof ool ooo oor oov or- ora orb orf orl oro orr orv ov- ova ovb ovf ovl ovo ovv ra- raa rab raf ral rao rar rav rba rbb rbf rbl rbo rbr rfa rfb rff rfl rfo rfr rfv rla rlf rll rlo rlr roa rob rof rol roo ror rov rra rrb rrf rrl rrr rva rvb rvf rvl rvo rvr rvv v-a vaa vab val vao var vav vba vbl vbo vbr vbv vfa vfb vff vfl vfr vfv vl- vla vlb vlf vll vlo vlv voa vob vof vol voo vor vov vra vrb vrf vrr vva vvb vvo vvr vvv