a-a a-c aaa aac aad aan aao aar ac- aca acc acd acn aco acr ad- ada adc add adn ado adr an- ana anc and ann ano anr aoa aoc aod aon aoo aor ar- ara arc ard arn aro arr c-- caa cac cad can cao car cca ccc ccd ccn cco ccr cda cdc cdd cdn cdo cdr cn- cna cnc cnd cnn cno cnr co- coa coc cod con coo cor cra crc crd crn cro crr daa dac dad dan dao dar dca dcc dcd dcn dco dcr dda ddc ddd ddn ddo ddr dna dnc dnd dnn dno dnr doa doc dod don doo dor dra drc drd drn dro drr naa nac nad nan nao nar nca ncc ncd ncn nco ncr nda ndc ndd ndn ndo ndr nna nnc nnn nno no- noa noc nod non noo nor nra nrc nrd nrn nro nrr oaa oac oad oan oao oar oc- oca occ ocd ocn oco ocr oda odc odd odn odo odr on- ona onc ond onn ono onr oo- ooa ooc ood oon ooo oor or- ora orc ord orn oro orr ra- raa rac rad ran rao rar rca rcc rcd rcn rco rcr rda rdc rdd rdn rdo rdr rna rnc rnd rnn rno rnr roa roc rod ron roo ror rra rrc rrd rrn rrr