-er -ic a-a a-b a-c a-i aaa aab aac aae aai aak aan aap aar ab- aba abb abc abe abi abk abn abp abr ac- aca acb acc ace aci ack acn acp acr aea aeb aec aee aei aek aen aep aer ai- aia aib aic aie aii aik ain aip air aka akb akc ake aki akk akn akp akr an- ana anb anc ane ani ank ann anp anr ap- apa apb apc ape api apk apn app apr ar- ara arb arc are ari ark arn arp arr b-p baa bab bac bae bai bak ban bap bar bba bbb bbc bbe bbi bbk bbn bbp bbr bca bcb bcc bce bci bck bcn bcp bcr be- bea beb bec bee bei bek ben bep ber bi- bia bib bic bie bii bik bin bip bir bka bkb bkc bke bkk bkn bkp bkr bna bnb bnc bne bni bnk bnn bnp bnr bpa bpb bpc bpe bpi bpn bpp bpr bra brb bre bri brk brn brp brr c-- caa cab cac cae cai cak can cap car cba cbb cbc cbe cbi cbk cbn cbp cbr cca ccb ccc cce cci cck ccn ccp ccr ce- cea ceb cec cee cei cek cen cep cer ci- cia cib cic cie cii cik cin cip cir cka ckb ckc cki cn- cna cnb cnc cne cni cnn cnp cnr cpa cpb cpc cpe cpi cpk cpn cpp cpr cra crb crc cre cri crk crn crp crr eaa eab eac eae eai eak ean eap ear eba ebb ebc ebe ebi ebk ebn ebp ebr ec- eca ecb ecc ece eci eck ecn ecr eea eeb eec eee eek een eep eer eia eib eic eie eii eik ein eip eir eka ekb ekc eke eki ekp ekr en- ena enb enc ene eni enk enn enp enr ep- epa epb epc epe epi epn epp epr era erb erc ere eri erk ern erp err ia- iaa iab iac iae iai ian iap iar iba ibb ibc ibe ibi ibk ibn ibp ibr ica icb icc ice ici ick icn icp icr ie- iea iec iee iei iek ien iep ier iia iib iic iie iii iin iip iir ika ikb ikc ike iki ikk ikr in- ina inb inc ine ini ink inn inp inr ipa ipb ipc ipe ipi ipn ipp ipr ir- ira irb irc ire iri irk irn irp irr ka- kaa kab kac kae kai kak kan kap kar kba kbb kbc kbe kbi kbk kbn kbp kbr kca kcb kcc kce kci kck kcn kcp kcr ke- kea keb kec kee kei kek ken kep ker kia kib kic kie kii kik kin kip kir kkb kkc kke kki kkk kkn kkp kkr kn- kna knc kne kni knk knn knp knr kpa kpc kpe kpi kpk kpn kpp kpr kra krc kri krk krn krp krr n-i naa nab nac nae nai nak nan nap nar nba nbb nbc nbe nbi nbk nbn nbp nbr nca ncb ncc nce nci nck ncn ncp ncr ne- nea neb nec nee nei nek nen nep ner nia nib nic nie nii nik nin nip nir nka nkc nke nki nkk nkn nkp nkr nna nnb nnc nne nni nnk nnn nnp npa npb npc npe npi npn npp npr nra nrb nrc nre nri nrk nrn nrp nrr p-p paa pab pac pae pai pak pan pap par pba pbb pbc pbe pbi pbk pbn pbp pbr pca pcb pcc pce pci pck pcn pcp pcr pea peb pec pee pei pek pen pep per pia pib pic pie pii pik pin pip pir pka pkb pkc pke pki pkn pkp pkr pn- pna pnb pnc pne pni pnk pnn pnp pnr ppa ppb ppc ppe ppi ppk ppn ppp ppr pra prb prc pre pri prk prn prp prr ra- raa rab rac rae rai rak ran rap rar rba rbb rbc rbe rbi rbk rbn rbp rbr rca rcb rcc rce rci rcn rcp rcr re- rea reb rec ree rei rek ren rep rer ria rib ric rie rii rik rin rip rir rkb rkc rke rkk rkp rna rnb rnc rni rnn rnp rnr rpa rpb rpc rpe rpi rpk rpn rpp rpr rra rrb rrc rri rrk rrn rrp rrr