-er -ic a-a a-c a-i aaa aac aae aaf aai aao aap aar aax ac- aca acc ace acf aci aco acp acr acx aea aec aee aef aei aeo aep aer aex af- afa afc afe aff afi afo afp afr afx ai- aia aic aie aif aii aio aip air aix aoa aoc aoe aof aoi aoo aop aor aox ap- apa apc ape apf api apo app apr apx ar- ara arc are arf ari aro arp arr arx ax- axa axe axi axo axp axr axx c-- caa cac cae caf cai cao cap car cax cca ccc cce ccf cci cco ccp ccr ccx ce- cea cec cee cef cei ceo cep cer cex cfa cfc cfe cff cfi cfo cfp cfr cfx ci- cia cic cie cif cii cio cip cir cix co- coa coc coe cof coi coo cop cor cox cpa cpc cpe cpf cpi cpo cpp cpr cpx cra crc cre crf cri cro crp crr crx cxc cxf cxi cxo cxp cxr cxx eaa eac eae eaf eai eao eap ear eax ec- eca ecc ece ecf eci eco ecr ecx eea eec eee eef eeo eep eer eex ef- efa efc efe eff efi efo efp efr efx eia eic eie eif eii eio eip eir eix eo- eoa eoc eoe eof eoi eoo eop eor ep- epa epc epe epf epi epo epp epr epx era erc ere erf eri ero erp err ex- exa exc exe exi exo exp exr exx faa fac fae faf fai fao fap far fax fca fcc fce fcf fci fco fcp fcr fcx fea fec fee fef fei feo fep fer fex ffa ffc ffe fff ffi ffo ffp ffr ffx fia fic fie fif fii fip fir fix foa foc foe fof foi foo fop for fox fpa fpc fpe fpi fpo fpp fpr fpx fra frc fre frf fri fro frp frr fxe fxi fxp fxr fxx i-f ia- iaa iac iae iaf iai iao iap iar ica icc ice icf ici ico icp icr ie- iea iec iee ief iei iep ier iex ifa ifc ife iff ifi ifo ifp ifr ifx iia iic iie iif iii iio iip iir iix io- ioa ioc ioe iof ioi ioo iop ior ipa ipc ipe ipf ipi ipo ipp ipr ipx ir- ira irc ire irf iri iro irp irr irx ixc ixe ixi o-i oaa oac oae oaf oai oao oap oar oax oc- oca occ ocf oci oco ocp ocr ocx oea oec oee oef oei oeo oep oer oex of- ofa ofc ofe off ofi ofo ofp ofr ofx oia oic oie oif oii oio oip oir oo- ooa ooc oof ooi ooo oop oor oox op- opa opc ope opf opi opo opp opr opx or- ora orc ore orf ori oro orp orr orx ox- oxa oxc oxf oxi oxo oxx p-p paa pac pae paf pai pao pap par pax pca pcc pce pcf pci pco pcp pcr pcx pea pec pee pef pei peo pep per pex pfa pfc pfe pff pfi pfo pfp pfr pfx pia pic pie pif pii pio pip pir pix poa poc poe pof poi poo pop por pox ppa ppc ppe ppf ppi ppo ppp ppr ppx pra prc pre prf pri pro prp prr prx pxc pxe pxr ra- raa rac rae raf rai rao rap rar rax rca rcc rce rcf rci rco rcp rcr rcx re- rea rec ree ref rei reo rep rer rex rfa rfc rfe rff rfi rfo rfp rfr ria ric rie rif rii rio rip rir rix roa roc roe rof roi roo rop ror rox rpa rpc rpe rpf rpi rpo rpp rpr rpx rra rrc rrf rri rrp rrr rxp rxr xaa xac xaf xap xar xcf xci xcp xcr xcx xee xep xer xex xfa xfe xfx xia xic xie xii xio xix xoa xoc xof xoi xoo xop xor xox xpa xpc xpe xpf xpo xpp xrc xrf xrx xxi xxo xxp xxx