-er a-a a-t aaa aae aar aat aav aax aea aee aer aet aev aex ar- ara are arr art arv arx at- ata ate atr att atv atx av- ava ave avr avt avx ax- axa axe axr axt axv axx eaa eae ear eat eav eax eea eee eer eet eev eex era ere err ert erv eta ete etr ett etv etx eva eve evr evt evv ex- exa exe exr ext exx ra- raa rae rar rat rav rax re- rea ree rer ret rev rex rra rrr rrt rta rte rtr rtt rtv rtx rva rve rvr rvt rvv rxr t-x taa tae tar tat tav tax te- tea tee ter tet tev tex tra tre trr trt trv trx tta tte ttr ttt ttv ttx tva tve tvr tvt tvx txe txt v-a v-e vaa vae var vat vav vax vea vee ver vet vex vra vre vrr vrt vta vte vtr vtt vtv vtx vva vvr vvt vvv vxa vxr vxv xaa xar xat xav xee xer xet xev xex xrt xrx xtr xtv xtx xvt xxv xxx