-ey bbb bbc bbe bbo bbs bby bcb bcc bce bco bcs bcv bcy be- beb bec bee beo bes bev bey bob boc boe boo bos bov boy bsb bsc bse bso bss bsv bsy bvb bvc bve bvo bvs bvv by- byc bye byo bys c-- cbb cbc cbe cbo cbs cbv cby ccb ccc cce cco ccs ccv ce- ceb cec cee ceo ces cev cey co- cob coc coe coo cos cov coy csb csc cse cso css csv csy cvb cvc cve cvo cvs cvv cyb cyc cye cyo cys ebb ebc ebe ebo ebs ebv eby ec- ecb ecc ece eco ecs ecv eeb eec eee eeo ees eev eey eo- eob eoc eoe eoo eos es- esb esc ese eso ess esv esy evb evc eve evo evs evv evy eyc eye eyo eys ob- obb obc obe obo obs obv oby oc- ocb occ oco ocs ocv oeb oec oee oeo oes oey oo- oob ooc ooo oos oov os- osb osc ose oso oss osv ov- ovb ovc ove ovo ovs ovv oye oyo oys sbb sbc sbe sbo sbs sbv sby scb scc sce sco scs scv se- seb sec see seo ses sev sey sob soc soe soo sos sov soy ss- ssb ssc sse sso sss ssv svb svc sve svo svs svv svy sy- syb syc sye sys v-e vbc vbo vbs vbv vcc vce vco vcs vcy veb vec vee veo ves vey vob voc voe voo vos vov voy vsb vsc vse vso vss vsv vvb vvc vvo vvs vvv vye ybc ybe ybs yby ycc yce yco ycs ycv ycy yeb yec yee yeo yes yev yey yob yoc yoe yoo yos yoy ysb ysc yse yso yss ysy yve yvo yvy yyb yyc yye yys yyy