-ic c-- ccc cci cco ccs ccx ci- cic cii cio cis cix co- coc coi coo cos cox csc csi cso css csx cxc cxi cxo cxs cxx icc ici ico ics iic iii iio iis iix io- ioc ioi ioo ios is- isc isi iso iss ixc ixi o-i oc- occ oci oco ocs ocx oic oii oio ois oo- ooc ooi ooo oos oox os- osc osi oso oss osx ox- oxc oxi oxo oxx scc sci sco scs scx sic sii sio sis six soc soi soo sos sox ss- ssc ssi sso sss ssx sxc sxi sxs xci xcx xic xii xio xis xix xoc xoi xoo xos xox xsc xsi xss xxi xxo xxx