-ic bbb bbc bbe bbi bbk bbo bbs bcb bcc bce bci bck bco bcs bcv be- beb bec bee bei bek beo bes bev bi- bib bic bie bii bik bio bis biv bkb bkc bke bkk bko bks bkv bob boc boe boi bok boo bos bov bsb bsc bse bsi bsk bso bss bsv bvb bvc bve bvi bvk bvo bvs bvv c-- cbb cbc cbe cbi cbk cbo cbs cbv ccb ccc cce cci cck cco ccs ccv ce- ceb cec cee cei cek ceo ces cev ci- cib cic cie cii cik cio cis civ ckb ckc cki cko cks co- cob coc coe coi cok coo cos cov csb csc cse csi csk cso css csv cvb cvc cve cvi cvk cvo cvs cvv ebb ebc ebe ebi ebk ebo ebs ebv ec- ecb ecc ece eci eck eco ecs ecv eeb eec eee eek eeo ees eev eib eic eie eii eik eio eis eiv ekb ekc eke eki eko eks ekv eo- eob eoc eoe eoi eok eoo eos es- esb esc ese esi esk eso ess esv evb evc eve evi evo evs evv i-v ibb ibc ibe ibi ibk ibo ibs ibv icb icc ice ici ick ico ics icv ie- iec iee iei iek ies iev iib iic iie iii iio iis ikb ikc ike iki ikk iko iks ikv io- iob ioc ioe ioi ioo ios iov is- isb isc ise isi isk iso iss isv ivb ivc ive ivi ivo ivs ivv kbb kbc kbe kbi kbk kbo kbs kcb kcc kce kci kck kcs ke- keb kec kee kei kek keo kes kev kib kic kie kii kik kio kis kiv kkb kkc kke kki kkk kks kkv kob koc koe koi kok koo kos ksb ksc kse ksi ksk kso kss ksv kvb kvi kvk kvo kvs kvv o-i ob- obb obc obe obi obk obo obs obv oc- ocb occ oci ock oco ocs ocv oeb oec oee oei oeo oes oib oic oie oii oik oio ois oiv okb okc oke oki okk oko oks oo- oob ooc ooi ook ooo oos oov os- osb osc ose osi osk oso oss osv ov- ovb ovc ove ovi ovo ovs ovv sbb sbc sbe sbi sbk sbo sbs sbv scb scc sce sci sck sco scs scv se- seb sec see sei sek seo ses sev sib sic sie sii sik sio sis siv sk- skb skc ske ski skk sko sks sob soc soe soi sok soo sos sov ss- ssb ssc sse ssi ssk sso sss ssv svb svc sve svi svk svo svs svv v-e vbc vbi vbk vbo vbs vbv vcc vce vci vco vcs veb vec vee vei vek veo ves vi- vib vic vie vii vik vio vis viv vkb vob voc voe voi vok voo vos vov vsb vsc vse vsi vsk vso vss vsv vvb vvc vvi vvo vvs vvv