a-a a-z aaa aan aao aap aas aaz an- ana ann ano anp ans anz aoa aon aoo aop aos ap- apa apn apo app aps as- asa asn aso asp ass asz az- aza azn azo azp azs azz naa nan nao nap nas naz nna nnn nno nnp nns nnz no- noa non noo nop nos noz npa npn npo npp nps npz nsa nsn nso nsp nss nsz nzo nzp nzs nzz oaa oan oao oap oas on- ona onn ono onp ons oo- ooa oon ooo oop oos op- opa opn opo opp ops os- osa osn oso osp oss oza ozo ozs ozz p-p paa pan pao pap pas paz pn- pna pnn pno pnp pns poa pon poo pop pos poz ppa ppn ppo ppp pps ppz ps- psa psn pso psp pss pzp saa san sao sap sas saz sna snn sno snp sns soa son soo sop sos soz spa spn spo spp sps spz ss- ssa ssn sso ssp sss ssz sza szp zaa zan zao zap zas zaz znn zno znp zns zo- zoa zon zoo zos zpo zpp zsa zsz zzs zzz