-al a-a a-b aaa aab aaf aal aar aav ab- aba abb abf abl abr abv af- afa afb aff afl afr afv al- ala alb alf all alr alv ar- ara arb arf arl arr arv av- ava avb avf avl avr baa bab baf bal bar bav bba bbb bbf bbl bbr bfa bfb bff bfl bfr bfv bla blb blf bll blr blv bra brb brf brl brr brv bva bvb bvl bvr bvv faa fab faf fal far fav fba fbb fbf fbl fbr ffa fff ffl ffr ffv fla flb flf fll flr fra frb frf frl frr fva la- laa lab laf lal lar lav lba lbb lbf lbl lbr lbv lfa lfb lff lfl lfr lla llb llf lll llr llv lra lrb lrf lrr lrv lva lvb lvf lvl lvr lvv ra- raa rab raf ral rar rav rba rbb rbf rbl rbr rfa rfb rff rfl rfr rfv rla rlf rll rlr rra rrb rrf rrl rrr rva rvb rvf rvl rvr rvv v-a vaa vab val var vav vba vbl vbr vbv vfa vfb vff vfl vfr vfv vl- vla vlb vlf vll vlv vra vrb vrf vrr vva vvb vvr vvv