-ic a-a a-c a-i aaa aac aad aai aax ac- aca acc acd aci acx ad- ada adc add adi adx ai- aia aic aid aii aix ax- axa axi axx c-- caa cac cad cai cax cca ccc ccd cci ccx cda cdc cdd cdi cdx ci- cia cic cid cii cix cxc cxi cxx daa dac dad dai dax dca dcc dcd dci dcx dda ddc ddd ddi ddx di- dia dic did dii dix dxc dxd dxi dxx i-d ia- iaa iac iad iai ica icc icd ici ida idc idd idi idx iia iic iid iii iix ixc ixi xaa xac xad xcd xci xcx xda xdc xdi xia xic xii xix xxi xxx