-ic a-a a-c a-i aaa aac aai aao aar aax ac- aca acc aci aco acr acx ai- aia aic aii aio air aix aoa aoc aoi aoo aor aox ar- ara arc ari aro arr arx ax- axa axi axo axr axx c-- caa cac cai cao car cax cca ccc cci cco ccr ccx ci- cia cic cii cio cir cix co- coa coc coi coo cor cox cra crc cri cro crr crx cxc cxi cxo cxr cxx ia- iaa iac iai iao iar ica icc ici ico icr iia iic iii iio iir iix io- ioa ioc ioi ioo ior ir- ira irc iri iro irr irx ixc ixi o-i oaa oac oai oao oar oax oc- oca occ oci oco ocr ocx oia oic oii oio oir oo- ooa ooc ooi ooo oor oox or- ora orc ori oro orr orx ox- oxa oxc oxi oxo oxx ra- raa rac rai rao rar rax rca rcc rci rco rcr rcx ria ric rii rio rir rix roa roc roi roo ror rox rra rrc rri rrr rxr xaa xac xar xci xcr xcx xia xic xii xio xix xoa xoc xoi xoo xor xox xrc xrx xxi xxo xxx