-ic a-a a-c a-i aaa aac aai aao aax ac- aca acc aci aco acx ai- aia aic aii aio aix aoa aoc aoi aoo aox ax- axa axi axo axx c-- caa cac cai cao cax cca ccc cci cco ccx ci- cia cic cii cio cix co- coa coc coi coo cox cxc cxi cxo cxx ia- iaa iac iai iao ica icc ici ico iia iic iii iio iix io- ioa ioc ioi ioo ixc ixi o-i oaa oac oai oao oax oc- oca occ oci oco ocx oia oic oii oio oo- ooa ooc ooi ooo oox ox- oxa oxc oxi oxo oxx xaa xac xci xcx xia xic xii xio xix xoa xoc xoi xoo xox xxi xxo xxx