a-a aaa aad aan aao aap aar aax ad- ada add adn ado adp adr adx an- ana and ann ano anp anr anx aoa aod aon aoo aop aor aox ap- apa apd apn apo app apr apx ar- ara ard arn aro arp arr arx ax- axa axn axo axp axr axx daa dad dan dao dap dar dax dda ddd ddn ddo ddp ddr ddx dna dnd dnn dno dnp dnr doa dod don doo dop dor dox dpa dpd dpn dpo dpp dpr dra drd drn dro drp drr drx dxd dxn dxo dxp dxr dxx naa nad nan nao nap nar nax nda ndd ndn ndo ndp ndr nna nnn nno nnp no- noa nod non noo nop nor nox npa npd npn npo npp npr nra nrd nrn nro nrp nrr nrx nxd oaa oad oan oao oap oar oax oda odd odn odo odp odr on- ona ond onn ono onp onr onx oo- ooa ood oon ooo oop oor oox op- opa opd opn opo opp opr opx or- ora ord orn oro orp orr orx ox- oxa oxn oxo oxx p-p paa pad pan pao pap par pax pda pdd pdn pdo pdp pdr pdx pn- pna pnd pnn pno pnp pnr pnx poa pod pon poo pop por pox ppa ppd ppn ppo ppp ppr ppx pra prd prn pro prp prr prx pxr ra- raa rad ran rao rap rar rax rda rdd rdn rdo rdp rdr rdx rna rnd rnn rno rnp rnr roa rod ron roo rop ror rox rpa rpd rpn rpo rpp rpr rpx rra rrd rrn rrp rrr rxp rxr xaa xad xan xap xar xda xdr xna xno xoa xod xon xoo xop xor xox xpa xpd xpn xpo xpp xrd xrx xxo xxp xxx