-er -ic a-a a-c a-i aaa aac aae aag aai aan aao aar aax ac- aca acc ace acg aci acn aco acr acx aea aec aee aeg aei aen aeo aer aex ag- aga agc age agg agi agn ago agr agx ai- aia aic aie aig aii ain aio air aix an- ana anc ane ang ani ann ano anr anx aoa aoc aoe aog aoi aon aoo aor aox ar- ara arc are arg ari arn aro arr arx ax- axa axe axi axn axo axr axx c-- caa cac cae cag cai can cao car cax cca ccc cce ccg cci ccn cco ccr ccx ce- cea cec cee ceg cei cen ceo cer cex cga cgc cge cgg cgi cgn cgo cgr ci- cia cic cie cig cii cin cio cir cix cn- cna cnc cne cng cni cnn cno cnr cnx co- coa coc coe cog coi con coo cor cox cra crc cre crg cri crn cro crr crx cxc cxi cxo cxr cxx eaa eac eae eag eai ean eao ear eax ec- eca ecc ece ecg eci ecn eco ecr ecx eea eec eee eeg een eeo eer eex ega egc ege egg egi egn ego egr egx eia eic eie eig eii ein eio eir eix en- ena enc ene eng eni enn eno enr eo- eoa eoc eoe eog eoi eon eoo eor era erc ere erg eri ern ero err ex- exa exc exe exi exo exr exx gaa gac gae gag gai gan gao gar gca gcc gce gcg gci gcn gco gcr ge- gea gec gee geg gei gen geo ger gex gga ggc ggg ggi ggn ggo ggr gia gic gie gig gii gin gio gir gna gnc gne gni gnn gno gnr goa goc goe gog goi gon goo gor gox gra grc gre grg gri grn gro grr grx gxa ia- iaa iac iae iag iai ian iao iar ica icc ice icg ici icn ico icr ie- iea iec iee ieg iei ien ier iex iga igc ige igg igi ign igo igr iia iic iie iii iin iio iir iix in- ina inc ine ing ini inn ino inr inx io- ioa ioc ioe iog ioi ion ioo ior ir- ira irc ire irg iri irn iro irr irx ixc ixe ixi ixn n-i naa nac nae nag nai nan nao nar nax nca ncc nce ncg nci ncn nco ncr ncx ne- nea nec nee neg nei nen neo ner nex nga ngc nge ngg ngi ngn ngo nia nic nie nig nii nin nio nir nix nna nnc nne nng nni nnn nno no- noa noc noe nog noi non noo nor nox nra nrc nre nrg nri nrn nro nrr nrx nxc o-i oaa oac oae oag oai oan oao oar oax oc- oca occ ocg oci ocn oco ocr ocx oea oec oee oeg oei oen oeo oer oex oga ogc oge ogg ogi ogn ogo ogx oia oic oie oii oin oio oir on- ona onc one ong oni onn ono onr onx oo- ooa ooc oog ooi oon ooo oor oox or- ora orc ore org ori orn oro orr orx ox- oxa oxc oxi oxn oxo oxx ra- raa rac rae rag rai ran rao rar rax rca rcc rce rcg rci rcn rco rcr rcx re- rea rec ree reg rei ren reo rer rex rga rgc rge rgg rgi rgn rgo rgr rgx ria ric rie rig rii rin rio rir rix rna rnc rng rni rnn rno rnr roa roc roe rog roi ron roo ror rox rra rrc rrg rri rrn rrr rxr xaa xac xag xan xar xci xcr xcx xee xeg xen xer xex xge xgi xia xic xie xii xin xio xix xna xnc xno xoa xoc xog xoi xon xoo xor xox xrc xrx xxi xxo xxx