a-a a-t aaa aan aao aar aat aax an- ana ann ano anr ant anx aoa aon aoo aor aot aox ar- ara arn aro arr art arx at- ata atn ato atr att atx ax- axa axn axo axr axt axx naa nan nao nar nat nax nna nnn nno nnt no- noa non noo nor not nox nra nrn nro nrr nrt nrx nta ntn nto ntr ntt ntx nxt oaa oan oao oar oat oax on- ona onn ono onr ont onx oo- ooa oon ooo oor oot oox or- ora orn oro orr ort orx ot- ota otn oto otr ott ox- oxa oxn oxo oxt oxx ra- raa ran rao rar rat rax rna rnn rno rnr rnt roa ron roo ror rot rox rra rrn rrr rrt rta rtn rto rtr rtt rtx rxr t-x taa tan tao tar tat tax tna tnn tno tnr tnt tnx to- toa ton too tor tot tox tra trn tro trr trt trx tta ttn tto ttr ttt ttx txn txt xaa xan xar xat xna xno xoa xon xoo xor xot xox xrt xrx xtr xtx xxo xxx