a-a aaa aad aan aao aar ad- ada add adn ado adr an- ana and ann ano anr aoa aod aon aoo aor ar- ara ard arn aro arr daa dad dan dao dar dda ddd ddn ddo ddr dna dnd dnn dno dnr doa dod don doo dor dra drd drn dro drr naa nad nan nao nar nda ndd ndn ndo ndr nna nnn nno no- noa nod non noo nor nra nrd nrn nro nrr oaa oad oan oao oar oda odd odn odo odr on- ona ond onn ono onr oo- ooa ood oon ooo oor or- ora ord orn oro orr ra- raa rad ran rao rar rda rdd rdn rdo rdr rna rnd rnn rno rnr roa rod ron roo ror rra rrd rrn rrr