a-a aaa aad aan aao aar aax ad- ada add adn ado adr adx an- ana and ann ano anr anx aoa aod aon aoo aor aox ar- ara ard arn aro arr arx ax- axa axn axo axr axx daa dad dan dao dar dax dda ddd ddn ddo ddr ddx dna dnd dnn dno dnr doa dod don doo dor dox dra drd drn dro drr drx dxd dxn dxo dxr dxx naa nad nan nao nar nax nda ndd ndn ndo ndr nna nnn nno no- noa nod non noo nor nox nra nrd nrn nro nrr nrx nxd oaa oad oan oao oar oax oda odd odn odo odr on- ona ond onn ono onr onx oo- ooa ood oon ooo oor oox or- ora ord orn oro orr orx ox- oxa oxn oxo oxx ra- raa rad ran rao rar rax rda rdd rdn rdo rdr rdx rna rnd rnn rno rnr roa rod ron roo ror rox rra rrd rrn rrr rxr xaa xad xan xar xda xdr xna xno xoa xod xon xoo xor xox xrd xrx xxo xxx