-er -ic a-a a-b a-c a-i aaa aab aac aae aaf aai aao aap aar aas ab- aba abb abc abe abf abi abo abp abr abs ac- aca acb acc ace acf aci aco acp acr acs aea aeb aec aee aef aei aeo aep aer aes af- afa afb afc afe aff afi afo afp afr afs ai- aia aib aic aie aif aii aio aip air ais aoa aob aoc aoe aof aoi aoo aop aor aos ap- apa apb apc ape apf api apo app apr aps ar- ara arb arc are arf ari aro arp arr ars as- asa asb asc ase asf asi aso asp asr ass b-p baa bab bac bae baf bai bao bap bar bas bba bbb bbc bbe bbf bbi bbo bbp bbr bbs bca bcb bcc bce bcf bci bco bcp bcr bcs be- bea beb bec bee bef bei beo bep ber bes bfa bfb bfc bfe bff bfi bfo bfp bfr bfs bi- bia bib bic bie bif bii bio bip bir bis boa bob boc boe bof boi boo bop bor bos bpa bpb bpc bpe bpf bpi bpo bpp bpr bps bra brb bre brf bri bro brp brr brs bsa bsb bsc bse bsf bsi bso bsp bsr bss c-- caa cab cac cae caf cai cao cap car cas cba cbb cbc cbe cbf cbi cbo cbp cbr cbs cca ccb ccc cce ccf cci cco ccp ccr ccs ce- cea ceb cec cee cef cei ceo cep cer ces cfa cfb cfc cfe cff cfi cfo cfp cfr cfs ci- cia cib cic cie cif cii cio cip cir cis co- coa cob coc coe cof coi coo cop cor cos cpa cpb cpc cpe cpf cpi cpo cpp cpr cps cra crb crc cre crf cri cro crp crr crs csa csb csc cse csf csi cso csp csr css eaa eab eac eae eaf eai eao eap ear eas eba ebb ebc ebe ebf ebi ebo ebp ebr ebs ec- eca ecb ecc ece ecf eci eco ecr ecs eea eeb eec eee eef eeo eep eer ees ef- efa efb efc efe eff efi efo efp efr efs eia eib eic eie eif eii eio eip eir eis eo- eoa eob eoc eoe eof eoi eoo eop eor eos ep- epa epb epc epe epf epi epo epp epr eps era erb erc ere erf eri ero erp err ers es- esa esb esc ese esf esi eso esp esr ess faa fab fac fae faf fai fao fap far fas fba fbb fbc fbe fbf fbi fbo fbp fbr fbs fca fcb fcc fce fcf fci fco fcp fcr fcs fea feb fec fee fef fei feo fep fer fes ffa ffc ffe fff ffi ffo ffp ffr ffs fia fib fic fie fif fii fip fir fis foa fob foc foe fof foi foo fop for fos fpa fpb fpc fpe fpi fpo fpp fpr fps fra frb frc fre frf fri fro frp frr frs fsa fsb fsc fse fsf fsi fso fsp fsr fss i-f ia- iaa iab iac iae iaf iai iao iap iar ias iba ibb ibc ibe ibf ibi ibo ibp ibr ibs ica icb icc ice icf ici ico icp icr ics ie- iea iec iee ief iei iep ier ies ifa ifb ifc ife iff ifi ifo ifp ifr ifs iia iib iic iie iif iii iio iip iir iis io- ioa iob ioc ioe iof ioi ioo iop ior ios ipa ipb ipc ipe ipf ipi ipo ipp ipr ips ir- ira irb irc ire irf iri iro irp irr irs is- isa isb isc ise isf isi iso isp isr iss o-i oaa oab oac oae oaf oai oao oap oar oas ob- oba obb obc obe obf obi obo obp obr obs oc- oca ocb occ ocf oci oco ocp ocr ocs oea oeb oec oee oef oei oeo oep oer oes of- ofa ofb ofc ofe off ofi ofo ofp ofr ofs oia oib oic oie oif oii oio oip oir ois oo- ooa oob ooc oof ooi ooo oop oor oos op- opa opb opc ope opf opi opo opp opr ops or- ora orb orc ore orf ori oro orp orr ors os- osa osb osc ose osf osi oso osp osr oss p-p paa pab pac pae paf pai pao pap par pas pba pbb pbc pbe pbf pbi pbo pbp pbr pbs pca pcb pcc pce pcf pci pco pcp pcr pcs pea peb pec pee pef pei peo pep per pes pfa pfb pfc pfe pff pfi pfo pfp pfr pfs pia pib pic pie pif pii pio pip pir pis poa pob poc poe pof poi poo pop por pos ppa ppb ppc ppe ppf ppi ppo ppp ppr pps pra prb prc pre prf pri pro prp prr prs ps- psa psb psc pse psf psi pso psp psr pss ra- raa rab rac rae raf rai rao rap rar ras rba rbb rbc rbe rbf rbi rbo rbp rbr rbs rca rcb rcc rce rcf rci rco rcp rcr rcs re- rea reb rec ree ref rei reo rep rer res rfa rfb rfc rfe rff rfi rfo rfp rfr rfs ria rib ric rie rif rii rio rip rir ris roa rob roc roe rof roi roo rop ror ros rpa rpb rpc rpe rpf rpi rpo rpp rpr rps rra rrb rrc rrf rri rrp rrr rrs rsa rsb rsc rse rsf rsi rso rsp rsr rss saa sab sac sae saf sai sao sap sar sas sba sbb sbc sbe sbf sbi sbo sbp sbr sbs sca scb scc sce scf sci sco scp scr scs se- sea seb sec see sef sei seo sep ser ses sfa sfb sfc sfe sff sfi sfo sfp sfr sfs sia sib sic sie sif sii sio sip sir sis soa sob soc soe sof soi soo sop