a-a aaa aad aaf aan aao aas ad- ada add adf adn ado ads af- afa afd aff afn afo afs an- ana and anf ann ano ans aoa aod aof aon aoo aos as- asa asd asf asn aso ass daa dad daf dan dao das dda ddd ddf ddn ddo dds dfa dfd dff dfn dfo dfs dna dnd dnf dnn dno dns doa dod dof don doo dos dsa dsd dsf dsn dso dss faa fad faf fan fao fas fda fdd fdf fdn fdo fds ffa ffd fff ffn ffo ffs fna fnd fnf fnn fns foa fof fon foo fos fsa fsd fsf fsn fso fss naa nad naf nan nao nas nda ndd ndf ndn ndo nds nfa nfd nff nfn nfo nfs nna nnf nnn nno nns no- noa nod nof non noo nos nsa nsd nsf nsn nso nss oaa oad oaf oan oao oas oda odd odf odn odo ods of- ofa ofd off ofn ofo ofs on- ona ond onf onn ono ons oo- ooa ood oof oon ooo oos os- osa osd osf osn oso oss saa sad saf san sao sas sda sdd sdf sdn sdo sds sfa sfd sff sfn sfo sfs sna snd snf snn sno sns soa sod sof son soo sos ss- ssa ssd ssf ssn sso sss