-ic a-a a-c a-i aaa aac aai aao aas aax ac- aca acc aci aco acs acx ai- aia aic aii aio ais aix aoa aoc aoi aoo aos aox as- asa asc asi aso ass asx ax- axa axi axo axs axx c-- caa cac cai cao cas cax cca ccc cci cco ccs ccx ci- cia cic cii cio cis cix co- coa coc coi coo cos cox csa csc csi cso css csx cxc cxi cxo cxs cxx ia- iaa iac iai iao ias ica icc ici ico ics iia iic iii iio iis iix io- ioa ioc ioi ioo ios is- isa isc isi iso iss ixc ixi o-i oaa oac oai oao oas oax oc- oca occ oci oco ocs ocx oia oic oii oio ois oo- ooa ooc ooi ooo oos oox os- osa osc osi oso oss osx ox- oxa oxc oxi oxo oxx saa sac sai sao sas sax sca scc sci sco scs scx sia sic sii sio sis six soa soc soi soo sos sox ss- ssa ssc ssi sso sss ssx sxc sxi sxs xaa xac xas xci xcx xia xic xii xio xis xix xoa xoc xoi xoo xos xox xsa xsc xsi xss xxi xxo xxx