-ic c-- ccc ccf cci cco ccx cfc cff cfi cfo cfx ci- cic cif cii cio cix co- coc cof coi coo cox cxc cxf cxi cxo cxx fcc fcf fci fco fcx ffc fff ffi ffo ffx fic fif fii fix foc fof foi foo fox fxi fxx i-f icc icf ici ico ifc iff ifi ifo ifx iic iif iii iio iix io- ioc iof ioi ioo ixc ixi o-i oc- occ ocf oci oco ocx of- ofc off ofi ofo ofx oic oif oii oio oo- ooc oof ooi ooo oox ox- oxc oxf oxi oxo oxx xcf xci xcx xfx xic xii xio xix xoc xof xoi xoo xox xxi xxo xxx