a-a a-t aaa aao aap aar aat aax aoa aoo aop aor aot aox ap- apa apo app apr apt apx ar- ara aro arp arr art arx at- ata ato atp atr att atx ax- axa axo axp axr axt axx oaa oao oap oar oat oax oo- ooa ooo oop oor oot oox op- opa opo opp opr opt opx or- ora oro orp orr ort orx ot- ota oto otp otr ott ox- oxa oxo oxt oxx p-p paa pao pap par pat pax poa poo pop por pot pox ppa ppo ppp ppr ppt ppx pra pro prp prr prt prx pt- pta pto ptp ptr ptt ptx pxr pxt ra- raa rao rap rar rat rax roa roo rop ror rot rox rpa rpo rpp rpr rpt rpx rra rrp rrr rrt rta rto rtp rtr rtt rtx rxp rxr t-x taa tao tap tar tat tax to- toa too top tor tot tox tpa tpo tpp tpr tpt tpx tra tro trp trr trt trx tta tto ttp ttr ttt ttx txt xaa xap xar xat xoa xoo xop xor xot xox xpa xpo xpp xpt xrt xrx xtp xtr xtx xxo xxp xxx