-ic bbb bbc bbe bbi bbo bbs bbx bcb bcc bce bci bco bcs bcx be- beb bec bee bei beo bes bex bi- bib bic bie bii bio bis bix bob boc boe boi boo bos box bsb bsc bse bsi bso bss bsx bxb bxi bxo bxx c-- cbb cbc cbe cbi cbo cbs cbx ccb ccc cce cci cco ccs ccx ce- ceb cec cee cei ceo ces cex ci- cib cic cie cii cio cis cix co- cob coc coe coi coo cos cox csb csc cse csi cso css csx cxc cxi cxo cxs cxx ebb ebc ebe ebi ebo ebs ebx ec- ecb ecc ece eci eco ecs ecx eeb eec eee eeo ees eex eib eic eie eii eio eis eix eo- eob eoc eoe eoi eoo eos es- esb esc ese esi eso ess esx ex- exc exe exi exo exs exx ibb ibc ibe ibi ibo ibs ibx icb icc ice ici ico ics ie- iec iee iei ies iex iib iic iie iii iio iis iix io- iob ioc ioe ioi ioo ios is- isb isc ise isi iso iss ixc ixe ixi o-i ob- obb obc obe obi obo obs obx oc- ocb occ oci oco ocs ocx oeb oec oee oei oeo oes oex oib oic oie oii oio ois oo- oob ooc ooi ooo oos oox os- osb osc ose osi oso oss osx ox- oxb oxc oxi oxo oxx sbb sbc sbe sbi sbo sbs sbx scb scc sce sci sco scs scx se- seb sec see sei seo ses sex sib sic sie sii sio sis six sob soc soe soi soo sos sox ss- ssb ssc sse ssi sso sss ssx sxc sxi sxs xbc xbe xbx xcb xci xcx xee xes xex xic xie xii xio xis xix xoc xoi xoo xos xox xsb xsc xsi xss xxi xxo xxx