-er -ic a-a a-c a-i aaa aac aae aah aai aao aar aax ac- aca acc ace ach aci aco acr acx aea aec aee aeh aei aeo aer aex aha ahc ahe ahh ahi aho ahr ahx ai- aia aic aie aih aii aio air aix aoa aoc aoe aoh aoi aoo aor aox ar- ara arc are arh ari aro arr arx ax- axa axe axh axi axo axr axx c-- caa cac cae cah cai cao car cax cca ccc cce cch cci cco ccr ccx ce- cea cec cee ceh cei ceo cer cex ch- cha chc che chh chi cho chr chx ci- cia cic cie cih cii cio cir cix co- coa coc coe coh coi coo cor cox cra crc cre crh cri cro crr crx cxc cxh cxi cxo cxr cxx eaa eac eae eah eai eao ear eax ec- eca ecc ece ech eci eco ecr ecx eea eec eee eeo eer eex eha ehc ehe ehh ehi eho ehr eia eic eie eii eio eir eix eo- eoa eoc eoe eoh eoi eoo eor era erc ere erh eri ero err ex- exa exc exe exh exi exo exr exx h-i haa hac hae hah hai hao har hax hca hcc hce hch hci hco hcr he- hea hec hee heh hei heo her hex hha hhc hhe hhh hhi hho hhr hia hic hie hih hii hio hir hix hoa hoc hoe hoh hoi hoo hor hox hr- hra hrc hre hrh hri hro hrr hxc ia- iaa iac iae iah iai iao iar ica icc ice ich ici ico icr ie- iea iec iee iei ier iex iha ihc ihe ihh ihi iho ihr iia iic iie iih iii iio iir iix io- ioa ioc ioe ioh ioi ioo ior ir- ira irc ire iri iro irr irx ixc ixe ixi o-i oaa oac oae oah oai oao oar oax oc- oca occ och oci oco ocr ocx oea oec oee oeh oei oeo oer oex oha ohc ohe ohh ohi oho ohr oia oic oie oii oio oir oo- ooa ooc ooh ooi ooo oor oox or- ora orc ore orh ori oro orr orx ox- oxa oxc oxi oxo oxx ra- raa rac rae rah rai rao rar rax rca rcc rce rch rci rco rcr rcx re- rea rec ree reh rei reo rer rex rh- rha rhc rhe rhh rhi rho rhr ria ric rie rih rii rio rir rix roa roc roe roh roi roo ror rox rra rrc rrh rri rrr rxr xaa xac xar xch xci xcr xcx xee xer xex xia xic xie xii xio xix xoa xoc xoi xoo xor xox xrc xrx xxi xxo xxx