a-a a-z aaa aad aao aar aaz ad- ada add ado adr adz aoa aod aoo aor ar- ara ard aro arr arz az- aza azd azo azz daa dad dao dar daz dda ddd ddo ddr ddz doa dod doo dor doz dra drd dro drr drz dza dzd dzo dzr oaa oad oao oar oda odd odo odr oo- ooa ood ooo oor or- ora ord oro orr orz oza ozo ozz ra- raa rad rao rar raz rda rdd rdo rdr roa rod roo ror roz rra rrd rrr rza rzo zaa zad zao zar zaz zo- zoa zod zoo zor zro zzr zzz