a-a a-z aaa aan aao aap aaz an- ana ann ano anp anz aoa aon aoo aop ap- apa apn apo app az- aza azn azo azp azz naa nan nao nap naz nna nnn nno nnp nnz no- noa non noo nop noz npa npn npo npp npz nzo nzp nzz oaa oan oao oap on- ona onn ono onp oo- ooa oon ooo oop op- opa opn opo opp oza ozo ozz p-p paa pan pao pap paz pn- pna pnn pno pnp poa pon poo pop poz ppa ppn ppo ppp ppz pzp zaa zan zao zap zaz znn zno znp zo- zoa zon zoo zpo zpp zzz