-er -ic a-a a-b a-c a-i aaa aab aac aae aai aak aap aar ab- aba abb abc abe abi abk abp abr ac- aca acb acc ace aci ack acp acr aea aeb aec aee aei aek aep aer ai- aia aib aic aie aii aik aip air aka akb akc ake aki akk akp akr ap- apa apb apc ape api apk app apr ar- ara arb arc are ari ark arp arr b-p baa bab bac bae bai bak bap bar bba bbb bbc bbe bbi bbk bbp bbr bca bcb bcc bce bci bck bcp bcr be- bea beb bec bee bei bek bep ber bi- bia bib bic bie bii bik bip bir bka bkb bkc bke bkk bkp bkr bpa bpb bpc bpe bpi bpp bpr bra brb bre bri brk brp brr c-- caa cab cac cae cai cak cap car cba cbb cbc cbe cbi cbk cbp cbr cca ccb ccc cce cci cck ccp ccr ce- cea ceb cec cee cei cek cep cer ci- cia cib cic cie cii cik cip cir cka ckb ckc cki cpa cpb cpc cpe cpi cpk cpp cpr cra crb crc cre cri crk crp crr eaa eab eac eae eai eak eap ear eba ebb ebc ebe ebi ebk ebp ebr ec- eca ecb ecc ece eci eck ecr eea eeb eec eee eek eep eer eia eib eic eie eii eik eip eir eka ekb ekc eke eki ekp ekr ep- epa epb epc epe epi epp epr era erb erc ere eri erk erp err ia- iaa iab iac iae iai iap iar iba ibb ibc ibe ibi ibk ibp ibr ica icb icc ice ici ick icp icr ie- iea iec iee iei iek iep ier iia iib iic iie iii iip iir ika ikb ikc ike iki ikk ikr ipa ipb ipc ipe ipi ipp ipr ir- ira irb irc ire iri irk irp irr ka- kaa kab kac kae kai kak kap kar kba kbb kbc kbe kbi kbk kbp kbr kca kcb kcc kce kci kck kcp kcr ke- kea keb kec kee kei kek kep ker kia kib kic kie kii kik kip kir kkb kkc kke kki kkk kkp kkr kpa kpc kpe kpi kpk kpp kpr kra krc kri krk krp krr p-p paa pab pac pae pai pak pap par pba pbb pbc pbe pbi pbk pbp pbr pca pcb pcc pce pci pck pcp pcr pea peb pec pee pei pek pep per pia pib pic pie pii pik pip pir pka pkb pkc pke pki pkp pkr ppa ppb ppc ppe ppi ppk ppp ppr pra prb prc pre pri prk prp prr ra- raa rab rac rae rai rak rap rar rba rbb rbc rbe rbi rbk rbp rbr rca rcb rcc rce rci rcp rcr re- rea reb rec ree rei rek rep rer ria rib ric rie rii rik rip rir rkb rkc rke rkk rkp rpa rpb rpc rpe rpi rpk rpp rpr rra rrb rrc rri rrk rrp rrr