-ic bbb bbc bbi bbk bbo bbs bcb bcc bci bck bco bcs bcv bi- bib bic bii bik bio bis biv bkb bkc bkk bko bks bkv bob boc boi bok boo bos bov bsb bsc bsi bsk bso bss bsv bvb bvc bvi bvk bvo bvs bvv c-- cbb cbc cbi cbk cbo cbs cbv ccb ccc cci cck cco ccs ccv ci- cib cic cii cik cio cis civ ckb ckc cki cko cks co- cob coc coi cok coo cos cov csb csc csi csk cso css csv cvb cvc cvi cvk cvo cvs cvv i-v ibb ibc ibi ibk ibo ibs ibv icb icc ici ick ico ics icv iib iic iii iio iis ikb ikc iki ikk iko iks ikv io- iob ioc ioi ioo ios iov is- isb isc isi isk iso iss isv ivb ivc ivi ivo ivs ivv kbb kbc kbi kbk kbo kbs kcb kcc kci kck kcs kib kic kii kik kio kis kiv kkb kkc kki kkk kks kkv kob koc koi kok koo kos ksb ksc ksi ksk kso kss ksv kvb kvi kvk kvo kvs kvv o-i ob- obb obc obi obk obo obs obv oc- ocb occ oci ock oco ocs ocv oib oic oii oik oio ois oiv okb okc oki okk oko oks oo- oob ooc ooi ook ooo oos oov os- osb osc osi osk oso oss osv ov- ovb ovc ovi ovo ovs ovv sbb sbc sbi sbk sbo sbs sbv scb scc sci sck sco scs scv sib sic sii sik sio sis siv sk- skb skc ski skk sko sks sob soc soi sok soo sos sov ss- ssb ssc ssi ssk sso sss ssv svb svc svi svk svo svs svv vbc vbi vbk vbo vbs vbv vcc vci vco vcs vi- vib vic vii vik vio vis viv vkb vob voc voi vok voo vos vov vsb vsc vsi vsk vso vss vsv vvb vvc vvi vvo vvs vvv