a-a a-c aaa aac aad aaf aah ac- aca acc acd acf ach ad- ada adc add adf adh af- afa afc afd aff afh aha ahc ahd ahf ahh c-- caa cac cad caf cah cca ccc ccd ccf cch cda cdc cdd cdf cdh cfa cfc cfd cff cfh ch- cha chc chd chf chh daa dac dad daf dah dca dcc dcd dcf dda ddc ddd ddf ddh dfa dfc dfd dff dfh dh- dha dhc dhd dhf dhh faa fac fad faf fah fca fcc fcd fcf fda fdc fdd fdf fdh ffa ffc ffd fff ffh fha fhc fhf fhh haa hac had haf hah hca hcc hcd hcf hch hda hdc hdd hdf hdh hfa hfc hfd hff hfh hha hhc hhd hhf hhh