a-a aaa aad aak aao aar aas ad- ada add adk ado adr ads aka akd akk ako akr aks aoa aod aok aoo aor aos ar- ara ard ark aro arr ars as- asa asd ask aso asr ass daa dad dak dao dar das dda ddd ddk ddo ddr dds dka dkk dko dkr dks doa dod dok doo dor dos dra drd drk dro drr drs dsa dsd dsk dso dsr dss ka- kaa kad kak kao kar kas kda kdk kdo kdr kds kkk kkr kks koa kod kok koo kor kos kra krd krk kro krr krs ksa ksd ksk kso ksr kss oaa oad oak oao oar oas oda odd odo odr ods oka okd okk oko okr oks oo- ooa ood ook ooo oor oos or- ora ord ork oro orr ors os- osa osd osk oso osr oss ra- raa rad rak rao rar ras rda rdd rdo rdr rds rkk rko rks roa rod rok roo ror ros rra rrd rrk rrr rrs rsa rsd rsk rso rsr rss saa sad sak sao sar sas sda sdd sdk sdo sdr sds sk- ska skd skk sko skr sks soa sod sok soo sor sos sr- sra srd srk sro srr srs ss- ssa ssd ssk sso ssr sss