bbb bbc bbm bbo bbr bbx bby bcb bcc bcm bco bcr bcx bcy bmb bmc bmm bmo bmr bmx bob boc bom boo bor box boy brb brm bro brr brx bry bxb bxm bxo bxx by- byc bym byo byr c-- cbb cbc cbm cbo cbr cbx cby ccb ccc ccm cco ccr ccx cmb cmc cmm cmo cmr cmx cmy co- cob coc com coo cor cox coy crb crc crm cro crr crx cry cxc cxo cxr cxx cyb cyc cym cyo cyr m-o m-r mbb mbc mbm mbo mbr mbx mc- mcb mcc mcm mco mcr mcx mmb mmc mmm mmo mmr mmx mob moc mom moo mor mox moy mrb mrc mrm mro mrr mrx mry mxc mxr my- myb myc mym myo myr myx ob- obb obc obm obo obr obx oby oc- ocb occ ocm oco ocr ocx om- omb omc omm omo omr omx omy oo- oob ooc oom ooo oor oox or- orb orc orm oro orr orx ory ox- oxb oxc oxo oxx oxy oyo rbb rbc rbm rbo rbr rbx rcb rcc rcm rco rcr rcx rmb rmc rmm rmo rmr rmx rob roc rom roo ror rox roy rrb rrc rrm rrr rxr ry- ryc rym ryo ryr ryy xbc xbr xbx xcb xcr xcx xmc xmm xmo xmr xmx xoc xom xoo xor xox xrc xrx xry xxo xxx xxy xyr xyy ybc ybm ybr yby ycc yco ycy ymc ymm ymo yob yoc yom yoo yor yox yoy yrc yro yxy yyb yyc yyy