a-a a-t aaa aan aao aap aar aat an- ana ann ano anp anr ant aoa aon aoo aop aor aot ap- apa apn apo app apr apt ar- ara arn aro arp arr art at- ata atn ato atp atr att naa nan nao nap nar nat nna nnn nno nnp nnt no- noa non noo nop nor not npa npn npo npp npr npt nra nrn nro nrp nrr nrt nta ntn nto ntp ntr ntt oaa oan oao oap oar oat on- ona onn ono onp onr ont oo- ooa oon ooo oop oor oot op- opa opn opo opp opr opt or- ora orn oro orp orr ort ot- ota otn oto otp otr ott p-p paa pan pao pap par pat pn- pna pnn pno pnp pnr pnt poa pon poo pop por pot ppa ppn ppo ppp ppr ppt pra prn pro prp prr prt pt- pta ptn pto ptp ptr ptt ra- raa ran rao rap rar rat rna rnn rno rnp rnr rnt roa ron roo rop ror rot rpa rpn rpo rpp rpr rpt rra rrn rrp rrr rrt rta rtn rto rtp rtr rtt taa tan tao tap tar tat tna tnn tno tnp tnr tnt to- toa ton too top tor tot tpa tpn tpo tpp tpr tpt tra trn tro trp trr trt tta ttn tto ttp ttr ttt