a-a a-i a-z aaa aaf aai aao aar aaz af- afa aff afi afo afr afz ai- aia aif aii aio air aiz aoa aof aoi aoo aor ar- ara arf ari aro arr arz az- aza azf azi azo azz faa faf fai fao far faz ffa fff ffi ffo ffr ffz fia fif fii fir fiz foa fof foi foo for foz fra frf fri fro frr i-f ia- iaa iaf iai iao iar iaz ifa iff ifi ifo ifr ifz iia iif iii iio iir io- ioa iof ioi ioo ior ir- ira irf iri iro irr iza izi izo izz o-i oaa oaf oai oao oar of- ofa off ofi ofo ofr ofz oia oif oii oio oir oiz oo- ooa oof ooi ooo oor or- ora orf ori oro orr orz oza ozo ozz ra- raa raf rai rao rar raz rfa rff rfi rfo rfr rfz ria rif rii rio rir riz roa rof roi roo ror roz rra rrf rri rrr rza rzo zaa zaf zai zao zar zaz zfa zfr zia zif zio zir ziz zo- zoa zof zoi zoo zor zro zzr zzz