a-a a-i aaa aaf aai aar aas af- afa aff afi afr afs ai- aia aif aii air ais ar- ara arf ari arr ars as- asa asf asi asr ass faa faf fai far fas ffa fff ffi ffr ffs fia fif fii fir fis fra frf fri frr frs fsa fsf fsi fsr fss i-f ia- iaa iaf iai iar ias ifa iff ifi ifr ifs iia iif iii iir iis ir- ira irf iri irr irs is- isa isf isi isr iss ra- raa raf rai rar ras rfa rff rfi rfr rfs ria rif rii rir ris rra rrf rri rrr rrs rsa rsf rsi rsr rss saa saf sai sar sas sfa sff sfi sfr sfs sia sif sii sir sis sr- sra srf sri srr srs ss- ssa ssf ssi ssr sss