-al a-a a-b aaa aab aal aar aav ab- aba abb abl abr abv al- ala alb all alr alv ar- ara arb arl arr arv av- ava avb avl avr baa bab bal bar bav bba bbb bbl bbr bla blb bll blr blv bra brb brl brr brv bva bvb bvl bvr bvv la- laa lab lal lar lav lba lbb lbl lbr lbv lla llb lll llr llv lra lrb lrr lrv lva lvb lvl lvr lvv ra- raa rab ral rar rav rba rbb rbl rbr rla rll rlr rra rrb rrl rrr rva rvb rvl rvr rvv v-a vaa vab val var vav vba vbl vbr vbv vl- vla vlb vll vlv vra vrb vrr vva vvb vvr vvv