a-a a-t aaa aar aat aav aax ar- ara arr art arv arx at- ata atr att atv atx av- ava avr avt avx ax- axa axr axt axv axx ra- raa rar rat rav rax rra rrr rrt rta rtr rtt rtv rtx rva rvr rvt rvv rxr t-x taa tar tat tav tax tra trr trt trv trx tta ttr ttt ttv ttx tva tvr tvt tvx txt v-a vaa var vat vav vax vra vrr vrt vta vtr vtt vtv vtx vva vvr vvt vvv vxa vxr vxv xaa xar xat xav xrt xrx xtr xtv xtx xvt xxv xxx