a-a a-z aaa aan aao aap aar aaz an- ana ann ano anp anr anz aoa aon aoo aop aor ap- apa apn apo app apr ar- ara arn aro arp arr arz az- aza azn azo azp azz naa nan nao nap nar naz nna nnn nno nnp nnz no- noa non noo nop nor noz npa npn npo npp npr npz nra nrn nro nrp nrr nrz nzo nzp nzz oaa oan oao oap oar on- ona onn ono onp onr oo- ooa oon ooo oop oor op- opa opn opo opp opr or- ora orn oro orp orr orz oza ozo ozz p-p paa pan pao pap par paz pn- pna pnn pno pnp pnr poa pon poo pop por poz ppa ppn ppo ppp ppr ppz pra prn pro prp prr prz pzp ra- raa ran rao rap rar raz rna rnn rno rnp rnr rnz roa ron roo rop ror roz rpa rpn rpo rpp rpr rpz rra rrn rrp rrr rza rzo zaa zan zao zap zar zaz znn zno znp zo- zoa zon zoo zor zpo zpp zpr zro zrp zzr zzz