a-a a-c aaa aac aad aak aao aas ac- aca acc acd ack aco acs ad- ada adc add adk ado ads aka akc akd akk ako aks aoa aoc aod aok aoo aos as- asa asc asd ask aso ass c-- caa cac cad cak cao cas cca ccc ccd cck cco ccs cda cdc cdd cdk cdo cds cka ckc ckd cko cks co- coa coc cod cok coo cos csa csc csd csk cso css daa dac dad dak dao das dca dcc dcd dck dco dcs dda ddc ddd ddk ddo dds dka dkc dkk dko dks doa doc dod dok doo dos dsa dsc dsd dsk dso dss ka- kaa kac kad kak kao kas kca kcc kcd kck kcs kda kdc kdk kdo kds kkc kkk kks koa koc kod kok koo kos ksa ksc ksd ksk kso kss oaa oac oad oak oao oas oc- oca occ ocd ock oco ocs oda odc odd odo ods oka okc okd okk oko oks oo- ooa ooc ood ook ooo oos os- osa osc osd osk oso oss saa sac sad sak sao sas sca scc scd sck sco scs sda sdc sdd sdk sdo sds sk- ska skc skd skk sko sks soa soc sod sok soo sos ss- ssa ssc ssd ssk sso sss