a-a a-b a-i a-z aaa aab aai aan aao aap aaz ab- aba abb abi abn abo abp abz ai- aia aib aii ain aio aip aiz an- ana anb ani ann ano anp anz aoa aob aoi aon aoo aop ap- apa apb api apn apo app az- aza azb azi azn azo azp azz b-p baa bab bai ban bao bap baz bba bbb bbi bbn bbo bbp bi- bia bib bii bin bio bip biz bna bnb bni bnn bno bnp bnz boa bob boi bon boo bop boz bpa bpb bpi bpn bpo bpp bza bzn bzo bzp bzz ia- iaa iab iai ian iao iap iaz iba ibb ibi ibn ibo ibp ibz iia iib iii iin iio iip in- ina inb ini inn ino inp io- ioa iob ioi ion ioo iop ipa ipb ipi ipn ipo ipp iza izi izo izz n-i naa nab nai nan nao nap naz nba nbb nbi nbn nbo nbp nia nib nii nin nio nip niz nna nnb nni nnn nno nnp nnz no- noa nob noi non noo nop noz npa npb npi npn npo npp npz nzb nzi nzo nzp nzz o-i oaa oab oai oan oao oap ob- oba obb obi obn obo obp oia oib oii oin oio oip oiz on- ona onb oni onn ono onp oo- ooa oob ooi oon ooo oop op- opa opb opi opn opo opp oza ozo ozz p-p paa pab pai pan pao pap paz pba pbb pbi pbn pbo pbp pbz pia pib pii pin pio pip piz pn- pna pnb pni pnn pno pnp poa pob poi pon poo pop poz ppa ppb ppi ppn ppo ppp ppz pzp zaa zab zai zan zao zap zaz zbb zia zib zin zio zip ziz znn zno znp zo- zoa zob zoi zon zoo zpi zpo zpp zzz