-ic a-a a-b a-c a-i aaa aab aac aae aai aak aan aao aap ab- aba abb abc abe abi abk abn abo abp ac- aca acb acc ace aci ack acn aco acp aea aeb aec aee aei aek aen aeo aep ai- aia aib aic aie aii aik ain aio aip aka akb akc ake aki akk akn ako akp an- ana anb anc ane ani ank ann ano anp aoa aob aoc aoe aoi aok aon aoo aop ap- apa apb apc ape api apk apn apo app b-p baa bab bac bae bai bak ban bao bap bba bbb bbc bbe bbi bbk bbn bbo bbp bca bcb bcc bce bci bck bcn bco bcp be- bea beb bec bee bei bek ben beo bep bi- bia bib bic bie bii bik bin bio bip bka bkb bkc bke bkk bkn bko bkp bna bnb bnc bne bni bnk bnn bno bnp boa bob boc boe boi bok bon boo bop bpa bpb bpc bpe bpi bpn bpo bpp c-- caa cab cac cae cai cak can cao cap cba cbb cbc cbe cbi cbk cbn cbo cbp cca ccb ccc cce cci cck ccn cco ccp ce- cea ceb cec cee cei cek cen ceo cep ci- cia cib cic cie cii cik cin cio cip cka ckb ckc cki cko cn- cna cnb cnc cne cni cnn cno cnp co- coa cob coc coe coi cok con coo cop cpa cpb cpc cpe cpi cpk cpn cpo cpp eaa eab eac eae eai eak ean eao eap eba ebb ebc ebe ebi ebk ebn ebo ebp ec- eca ecb ecc ece eci eck ecn eco eea eeb eec eee eek een eeo eep eia eib eic eie eii eik ein eio eip eka ekb ekc eke eki eko ekp en- ena enb enc ene eni enk enn eno enp eo- eoa eob eoc eoe eoi eok eon eoo eop ep- epa epb epc epe epi epn epo epp ia- iaa iab iac iae iai ian iao iap iba ibb ibc ibe ibi ibk ibn ibo ibp ica icb icc ice ici ick icn ico icp ie- iea iec iee iei iek ien iep iia iib iic iie iii iin iio iip ika ikb ikc ike iki ikk iko in- ina inb inc ine ini ink inn ino inp io- ioa iob ioc ioe ioi ion ioo iop ipa ipb ipc ipe ipi ipn ipo ipp ka- kaa kab kac kae kai kak kan kao kap kba kbb kbc kbe kbi kbk kbn kbo kbp kca kcb kcc kce kci kck kcn kcp ke- kea keb kec kee kei kek ken keo kep kia kib kic kie kii kik kin kio kip kkb kkc kke kki kkk kkn kkp kn- kna knc kne kni knk knn kno knp koa kob koc koe koi kok kon koo kop kpa kpc kpe kpi kpk kpn kpo kpp n-i naa nab nac nae nai nak nan nao nap nba nbb nbc nbe nbi nbk nbn nbo nbp nca ncb ncc nce nci nck ncn nco ncp ne- nea neb nec nee nei nek nen neo nep nia nib nic nie nii nik nin nio nip nka nkc nke nki nkk nkn nko nkp nna nnb nnc nne nni nnk nnn nno nnp no- noa nob noc noe noi nok non noo nop npa npb npc npe npi npn npo npp o-i oaa oab oac oae oai oak oan oao oap ob- oba obb obc obe obi obk obn obo obp oc- oca ocb occ oci ock ocn oco ocp oea oeb oec oee oei oen oeo oep oia oib oic oie oii oik oin oio oip oka okb okc oke oki okk oko okp on- ona onb onc one oni onk onn ono onp oo- ooa oob ooc ooi ook oon ooo oop op- opa opb opc ope opi opk opn opo opp p-p paa pab pac pae pai pak pan pao pap pba pbb pbc pbe pbi pbk pbn pbo pbp pca pcb pcc pce pci pck pcn pco pcp pea peb pec pee pei pek pen peo pep pia pib pic pie pii pik pin pio pip pka pkb pkc pke pki pkn pko pkp pn- pna pnb pnc pne pni pnk pnn pno pnp poa pob poc poe poi pok pon poo pop ppa ppb ppc ppe ppi ppk ppn ppo ppp