a-a a-c aaa aac aad aak aan aao aar ac- aca acc acd ack acn aco acr ad- ada adc add adk adn ado adr aka akc akd akk akn ako akr an- ana anc and ank ann ano anr aoa aoc aod aok aon aoo aor ar- ara arc ard ark arn aro arr c-- caa cac cad cak can cao car cca ccc ccd cck ccn cco ccr cda cdc cdd cdk cdn cdo cdr cka ckc ckd cko cn- cna cnc cnd cnn cno cnr co- coa coc cod cok con coo cor cra crc crd crk crn cro crr daa dac dad dak dan dao dar dca dcc dcd dck dcn dco dcr dda ddc ddd ddk ddn ddo ddr dka dkc dkk dko dkr dna dnc dnd dnk dnn dno dnr doa doc dod dok don doo dor dra drc drd drk drn dro drr ka- kaa kac kad kak kan kao kar kca kcc kcd kck kcn kcr kda kdc kdk kdo kdr kkc kkk kkn kkr kn- kna knc knd knk knn kno knr koa koc kod kok kon koo kor kra krc krd krk krn kro krr naa nac nad nak nan nao nar nca ncc ncd nck ncn nco ncr nda ndc ndd ndk ndn ndo ndr nka nkc nkk nkn nko nkr nna nnc nnk nnn nno no- noa noc nod nok non noo nor nra nrc nrd nrk nrn nro nrr oaa oac oad oak oan oao oar oc- oca occ ocd ock ocn oco ocr oda odc odd odn odo odr oka okc okd okk oko okr on- ona onc ond onk onn ono onr oo- ooa ooc ood ook oon ooo oor or- ora orc ord ork orn oro orr ra- raa rac rad rak ran rao rar rca rcc rcd rcn rco rcr rda rdc rdd rdn rdo rdr rkc rkk rko rna rnc rnd rnn rno rnr roa roc rod rok ron roo ror rra rrc rrd rrk rrn rrr