-er -ic a-a a-b a-c a-i aaa aab aac aad aae aai aap aar aas ab- aba abb abc abd abe abi abp abr abs ac- aca acb acc acd ace aci acp acr acs ad- ada adb adc add ade adi adp adr ads aea aeb aec aed aee aei aep aer aes ai- aia aib aic aid aie aii aip air ais ap- apa apb apc apd ape api app apr aps ar- ara arb arc ard are ari arp arr ars as- asa asb asc asd ase asi asp asr ass b-p baa bab bac bad bae bai bap bar bas bba bbb bbc bbd bbe bbi bbp bbr bbs bca bcb bcc bcd bce bci bcp bcr bcs bda bdb bdc bdd bde bdi bdp bdr bds be- bea beb bec bed bee bei bep ber bes bi- bia bib bic bid bie bii bip bir bis bpa bpb bpc bpd bpe bpi bpp bpr bps bra brb brd bre bri brp brr brs bsa bsb bsc bsd bse bsi bsp bsr bss c-- caa cab cac cad cae cai cap car cas cba cbb cbc cbd cbe cbi cbp cbr cbs cca ccb ccc ccd cce cci ccp ccr ccs cda cdb cdc cdd cde cdi cdp cdr cds ce- cea ceb cec ced cee cei cep cer ces ci- cia cib cic cid cie cii cip cir cis cpa cpb cpc cpd cpe cpi cpp cpr cps cra crb crc crd cre cri crp crr crs csa csb csc csd cse csi csp csr css daa dab dac dad dae dai dap dar das dba dbb dbc dbd dbe dbi dbp dbr dbs dca dcb dcc dcd dce dci dcp dcr dcs dda ddb ddc ddd dde ddi ddp ddr dds de- dea deb dec ded dee dei dep der des di- dia dib dic did die dii dip dir dis dpa dpb dpc dpd dpe dpi dpp dpr dps dra drb drc drd dre dri drp drr drs dsa dsb dsc dsd dse dsi dsp dsr dss eaa eab eac ead eae eai eap ear eas eba ebb ebc ebd ebe ebi ebp ebr ebs ec- eca ecb ecc ecd ece eci ecr ecs ed- eda edb edc edd ede edi edp edr eds eea eeb eec eed eee eep eer ees eia eib eic eid eie eii eip eir eis ep- epa epb epc epd epe epi epp epr eps era erb erc erd ere eri erp err ers es- esa esb esc esd ese esi esp esr ess i-d ia- iaa iab iac iad iae iai iap iar ias iba ibb ibc ibd ibe ibi ibp ibr ibs ica icb icc icd ice ici icp icr ics ida idb idc idd ide idi idp idr ids ie- iea iec ied iee iei iep ier ies iia iib iic iid iie iii iip iir iis ipa ipb ipc ipd ipe ipi ipp ipr ips ir- ira irb irc ird ire iri irp irr irs is- isa isb isc isd ise isi isp isr iss p-p paa pab pac pad pae pai pap par pas pba pbb pbc pbd pbe pbi pbp pbr pbs pca pcb pcc pcd pce pci pcp pcr pcs pda pdb pdc pdd pde pdi pdp pdr pds pea peb pec ped pee pei pep per pes pia pib pic pid pie pii pip pir pis ppa ppb ppc ppd ppe ppi ppp ppr pps pra prb prc prd pre pri prp prr prs ps- psa psb psc psd pse psi psp psr pss ra- raa rab rac rad rae rai rap rar ras rba rbb rbc rbd rbe rbi rbp rbr rbs rca rcb rcc rcd rce rci rcp rcr rcs rda rdb rdc rdd rde rdi rdp rdr rds re- rea reb rec red ree rei rep rer res ria rib ric rid rie rii rip rir ris rpa rpb rpc rpd rpe rpi rpp rpr rps rra rrb rrc rrd rri rrp rrr rrs rsa rsb rsc rsd rse rsi rsp rsr rss saa sab sac sad sae sai sap sar sas sba sbb sbc sbd sbe sbi sbp sbr sbs sca scb scc scd sce sci scp scr scs sda sdb sdc sdd sde sdi sdp sdr sds se- sea seb sec sed see sei sep ser ses sia sib sic sid sie sii sip sir sis spa spb spc spd spe spi spp spr sps sr- sra srb src srd sre sri srp srr srs ss- ssa ssb ssc ssd sse ssi ssp ssr sss