-er -ic a-a a-b a-c a-i aaa aab aac aad aae aai aap aar ab- aba abb abc abd abe abi abp abr ac- aca acb acc acd ace aci acp acr ad- ada adb adc add ade adi adp adr aea aeb aec aed aee aei aep aer ai- aia aib aic aid aie aii aip air ap- apa apb apc apd ape api app apr ar- ara arb arc ard are ari arp arr b-p baa bab bac bad bae bai bap bar bba bbb bbc bbd bbe bbi bbp bbr bca bcb bcc bcd bce bci bcp bcr bda bdb bdc bdd bde bdi bdp bdr be- bea beb bec bed bee bei bep ber bi- bia bib bic bid bie bii bip bir bpa bpb bpc bpd bpe bpi bpp bpr bra brb brd bre bri brp brr c-- caa cab cac cad cae cai cap car cba cbb cbc cbd cbe cbi cbp cbr cca ccb ccc ccd cce cci ccp ccr cda cdb cdc cdd cde cdi cdp cdr ce- cea ceb cec ced cee cei cep cer ci- cia cib cic cid cie cii cip cir cpa cpb cpc cpd cpe cpi cpp cpr cra crb crc crd cre cri crp crr daa dab dac dad dae dai dap dar dba dbb dbc dbd dbe dbi dbp dbr dca dcb dcc dcd dce dci dcp dcr dda ddb ddc ddd dde ddi ddp ddr de- dea deb dec ded dee dei dep der di- dia dib dic did die dii dip dir dpa dpb dpc dpd dpe dpi dpp dpr dra drb drc drd dre dri drp drr eaa eab eac ead eae eai eap ear eba ebb ebc ebd ebe ebi ebp ebr ec- eca ecb ecc ecd ece eci ecr ed- eda edb edc edd ede edi edp edr eea eeb eec eed eee eep eer eia eib eic eid eie eii eip eir ep- epa epb epc epd epe epi epp epr era erb erc erd ere eri erp err i-d ia- iaa iab iac iad iae iai iap iar iba ibb ibc ibd ibe ibi ibp ibr ica icb icc icd ice ici icp icr ida idb idc idd ide idi idp idr ie- iea iec ied iee iei iep ier iia iib iic iid iie iii iip iir ipa ipb ipc ipd ipe ipi ipp ipr ir- ira irb irc ird ire iri irp irr p-p paa pab pac pad pae pai pap par pba pbb pbc pbd pbe pbi pbp pbr pca pcb pcc pcd pce pci pcp pcr pda pdb pdc pdd pde pdi pdp pdr pea peb pec ped pee pei pep per pia pib pic pid pie pii pip pir ppa ppb ppc ppd ppe ppi ppp ppr pra prb prc prd pre pri prp prr ra- raa rab rac rad rae rai rap rar rba rbb rbc rbd rbe rbi rbp rbr rca rcb rcc rcd rce rci rcp rcr rda rdb rdc rdd rde rdi rdp rdr re- rea reb rec red ree rei rep rer ria rib ric rid rie rii rip rir rpa rpb rpc rpd rpe rpi rpp rpr rra rrb rrc rrd rri rrp rrr