a-a a-c aaa aac aaf aah aay ac- aca acc acf ach acy af- afa afc aff afh afy aha ahc ahf ahh ahy ay- aya ayc ayf ayh c-- caa cac caf cah cay cca ccc ccf cch cfa cfc cff cfh ch- cha chc chf chh chy cya cyc cyf faa fac faf fah fay fca fcc fcf fcy ffa ffc fff ffh ffy fha fhc fhf fhh fy- fya fyc haa hac haf hah hay hca hcc hcf hch hcy hfa hfc hff hfh hfy hha hhc hhf hhh hhy hy- hya hyc hyh hyy yaa yac yaf yah yay yca ycc ycf ych ycy yfa yfc yff yha yhc yyc yyf yyy