bbb bbc bbh bbn bbo bbs bcb bcc bch bcn bco bcs bhb bhc bhh bho bhs bnb bnc bnn bno bns bob boc boh bon boo bos bsb bsc bsh bsn bso bss c-- cbb cbc cbh cbn cbo cbs ccb ccc cch ccn cco ccs ch- chb chc chh chn cho chs cn- cnb cnc cnh cnn cno cns co- cob coc coh con coo cos csb csc csh csn cso css hbb hbc hbh hbn hbo hbs hcb hcc hch hcn hco hcs hhb hhc hhh hhn hho hhs hnb hnc hnh hnn hno hns hob hoc hoh hon hoo hos hsb hsc hsh hsn hss nbb nbc nbn nbo nbs ncb ncc nch ncn nco ncs nhb nhc nhh nhn nhs nnb nnc nnh nnn nno nns no- nob noc noh non noo nos nsb nsc nsh nsn nso nss ob- obb obc obh obn obo obs oc- ocb occ och ocn oco ocs ohc ohh ohn oho ohs on- onb onc onh onn ono ons oo- oob ooc ooh oon ooo oos os- osb osc osh osn oso oss sbb sbc sbh sbn sbo sbs scb scc sch scn sco scs sh- shb shc shh shn sho shs snb snc snn sno sns sob soc soh son soo sos ss- ssb ssc ssh ssn sso sss