a-a a-i aaa aaf aai aao aar af- afa aff afi afo afr ai- aia aif aii aio air aoa aof aoi aoo aor ar- ara arf ari aro arr faa faf fai fao far ffa fff ffi ffo ffr fia fif fii fir foa fof foi foo for fra frf fri fro frr i-f ia- iaa iaf iai iao iar ifa iff ifi ifo ifr iia iif iii iio iir io- ioa iof ioi ioo ior ir- ira irf iri iro irr o-i oaa oaf oai oao oar of- ofa off ofi ofo ofr oia oif oii oio oir oo- ooa oof ooi ooo oor or- ora orf ori oro orr ra- raa raf rai rao rar rfa rff rfi rfo rfr ria rif rii rio rir roa rof roi roo ror rra rrf rri rrr