a-a a-c aaa aac aad aaf aan aao aar ac- aca acc acd acf acn aco acr ad- ada adc add adf adn ado adr af- afa afc afd aff afn afo afr an- ana anc and anf ann ano anr aoa aoc aod aof aon aoo aor ar- ara arc ard arf arn aro arr c-- caa cac cad caf can cao car cca ccc ccd ccf ccn cco ccr cda cdc cdd cdf cdn cdo cdr cfa cfc cfd cff cfn cfo cfr cn- cna cnc cnd cnf cnn cno cnr co- coa coc cod cof con coo cor cra crc crd crf crn cro crr daa dac dad daf dan dao dar dca dcc dcd dcf dcn dco dcr dda ddc ddd ddf ddn ddo ddr dfa dfc dfd dff dfn dfo dfr dna dnc dnd dnf dnn dno dnr doa doc dod dof don doo dor dra drc drd drn dro drr faa fac fad faf fan fao far fca fcc fcd fcf fcn fco fcr fda fdc fdd fdf fdn fdo fdr ffa ffc ffd fff ffn ffo ffr fna fnc fnd fnf fnn fnr foa foc fof fon foo for fra frc frd frf frn fro frr naa nac nad naf nan nao nar nca ncc ncd ncf ncn nco ncr nda ndc ndd ndf ndn ndo ndr nfa nfc nfd nff nfn nfo nfr nna nnc nnf nnn nno no- noa noc nod nof non noo nor nra nrc nrd nrf nrn nro nrr oaa oac oad oaf oan oao oar oc- oca occ ocd ocf ocn oco ocr oda odc odd odf odn odo odr of- ofa ofc ofd off ofn ofo ofr on- ona onc ond onf onn ono onr oo- ooa ooc ood oof oon ooo oor or- ora orc ord orf orn oro orr ra- raa rac rad raf ran rao rar rca rcc rcd rcf rcn rco rcr rda rdc rdd rdf rdn rdo rdr rfa rfc rfd rff rfn rfo rfr rna rnc rnd rnn rno rnr roa roc rod rof ron roo ror rra rrc rrd rrf rrn rrr