a-a a-i a-t aaa aaf aai aas aat af- afa aff afi afs aft ai- aia aif aii ais ait as- asa asf asi ass ast at- ata atf ati ats att faa faf fai fas fat ffa fff ffi ffs fft fia fif fii fis fit fsa fsf fsi fss fst fta ftf fti fts ftt i-f ia- iaa iaf iai ias iat ifa iff ifi ifs ift iia iif iii iis iit is- isa isf isi iss ist ita itf iti its itt saa saf sai sas sat sfa sff sfi sfs sft sia sif sii sis sit ss- ssa ssf ssi sss sst sta stf sti sts stt taa taf tai tas tat tfa tff tfi tfs tft tia tif tii tis tit tsa tsf tsi tss tst tta ttf tti tts ttt