a-a a-c aaa aac aad aae aaf aas ac- aca acc acd ace acf acs ad- ada adc add ade adf ads aea aec aed aee aef aes af- afa afc afd afe aff afs as- asa asc asd ase asf ass c-- caa cac cad cae caf cas cca ccc ccd cce ccf ccs cda cdc cdd cde cdf cds ce- cea cec ced cee cef ces cfa cfc cfd cfe cff cfs csa csc csd cse csf css daa dac dad dae daf das dca dcc dcd dce dcf dcs dda ddc ddd dde ddf dds de- dea dec ded dee def des dfa dfc dfd dfe dff dfs dsa dsc dsd dse dsf dss eaa eac ead eae eaf eas ec- eca ecc ecd ece ecf ecs ed- eda edc edd ede edf eds eea eec eed eee eef ees ef- efa efc efd efe eff efs es- esa esc esd ese esf ess faa fac fad fae faf fas fca fcc fcd fce fcf fcs fda fdc fdd fde fdf fds fea fec fed fee fef fes ffa ffc ffd ffe fff ffs fsa fsc fsd fse fsf fss saa sac sad sae saf sas sca scc scd sce scf scs sda sdc sdd sde sdf sds se- sea sec sed see sef ses sfa sfc sfd sfe sff sfs ss- ssa ssc ssd sse ssf sss