-er -ic a-a a-c a-i aaa aac aad aae aai aar aax ac- aca acc acd ace aci acr acx ad- ada adc add ade adi adr adx aea aec aed aee aei aer aex ai- aia aic aid aie aii air aix ar- ara arc ard are ari arr arx ax- axa axe axi axr axx c-- caa cac cad cae cai car cax cca ccc ccd cce cci ccr ccx cda cdc cdd cde cdi cdr cdx ce- cea cec ced cee cei cer cex ci- cia cic cid cie cii cir cix cra crc crd cre cri crr crx cxc cxi cxr cxx daa dac dad dae dai dar dax dca dcc dcd dce dci dcr dcx dda ddc ddd dde ddi ddr ddx de- dea dec ded dee dei der dex di- dia dic did die dii dir dix dra drc drd dre dri drr drx dxc dxd dxi dxr dxx eaa eac ead eae eai ear eax ec- eca ecc ecd ece eci ecr ecx ed- eda edc edd ede edi edr edx eea eec eed eee eer eex eia eic eid eie eii eir eix era erc erd ere eri err ex- exa exc exd exe exi exr exx i-d ia- iaa iac iad iae iai iar ica icc icd ice ici icr ida idc idd ide idi idr idx ie- iea iec ied iee iei ier iex iia iic iid iie iii iir iix ir- ira irc ird ire iri irr irx ixc ixe ixi ra- raa rac rad rae rai rar rax rca rcc rcd rce rci rcr rcx rda rdc rdd rde rdi rdr rdx re- rea rec red ree rei rer rex ria ric rid rie rii rir rix rra rrc rrd rri rrr rxr xaa xac xad xar xcd xci xcr xcx xda xdc xde xdi xdr xed xee xer xex xia xic xie xii xix xrc xrd xrx xxi xxx