bbb bbh bbn bbo bbs bhb bhh bho bhs bnb bnn bno bns bob boh bon boo bos bsb bsh bsn bso bss hbb hbh hbn hbo hbs hhb hhh hhn hho hhs hnb hnh hnn hno hns hob hoh hon hoo hos hsb hsh hsn hss nbb nbn nbo nbs nhb nhh nhn nhs nnb nnh nnn nno nns no- nob noh non noo nos nsb nsh nsn nso nss ob- obb obh obn obo obs ohh ohn oho ohs on- onb onh onn ono ons oo- oob ooh oon ooo oos os- osb osh osn oso oss sbb sbh sbn sbo sbs sh- shb shh shn sho shs snb snn sno sns sob soh son soo sos ss- ssb ssh ssn sso sss