-ic bbb bbc bbf bbi bbo bbr bbx bcb bcc bcf bci bco bcr bcx bfb bfc bff bfi bfo bfr bfx bi- bib bic bif bii bio bir bix bob boc bof boi boo bor box brb brf bri bro brr brx bxb bxi bxo bxx c-- cbb cbc cbf cbi cbo cbr cbx ccb ccc ccf cci cco ccr ccx cfb cfc cff cfi cfo cfr cfx ci- cib cic cif cii cio cir cix co- cob coc cof coi coo cor cox crb crc crf cri cro crr crx cxc cxf cxi cxo cxr cxx fbb fbc fbf fbi fbo fbr fbx fcb fcc fcf fci fco fcr fcx ffc fff ffi ffo ffr ffx fib fic fif fii fir fix fob foc fof foi foo for fox frb frc frf fri fro frr fxi fxr fxx i-f ibb ibc ibf ibi ibo ibr ibx icb icc icf ici ico icr ifb ifc iff ifi ifo ifr ifx iib iic iif iii iio iir iix io- iob ioc iof ioi ioo ior ir- irb irc irf iri iro irr irx ixc ixi o-i ob- obb obc obf obi obo obr obx oc- ocb occ ocf oci oco ocr ocx of- ofb ofc off ofi ofo ofr ofx oib oic oif oii oio oir oo- oob ooc oof ooi ooo oor oox or- orb orc orf ori oro orr orx ox- oxb oxc oxf oxi oxo oxx rbb rbc rbf rbi rbo rbr rbx rcb rcc rcf rci rco rcr rcx rfb rfc rff rfi rfo rfr rib ric rif rii rio rir rix rob roc rof roi roo ror rox rrb rrc rrf rri rrr rxr xbc xbr xbx xcb xcf xci xcr xcx xfx xic xii xio xix xoc xof xoi xoo xor xox xrc xrf xrx xxi xxo xxx