-ol bbb bbc bbe bbh bbl bbo bcb bcc bce bch bcl bco be- beb bec bee beh bel beo bhb bhc bhe bhh bhl bho blb blc ble blh bll blo bob boc boe boh bol boo c-- cbb cbc cbe cbh cbl cbo ccb ccc cce cch ccl cco ce- ceb cec cee ceh cel ceo ch- chb chc che chh chl cho cl- clb clc cle clh cll clo co- cob coc coe coh col coo ebb ebc ebe ebh ebl ebo ec- ecb ecc ece ech ecl eco eeb eec eee eel eeo ehb ehc ehe ehh ehl eho elb elc ele elh ell elo eo- eob eoc eoe eoh eol eoo hbb hbc hbe hbh hbl hbo hcb hcc hce hch hcl hco he- heb hec hee heh hel heo hhb hhc hhe hhh hhl hho hlb hlc hle hlh hll hlo hob hoc hoe hoh hol hoo lbb lbc lbe lbh lbl lbo lcb lcc lce lch lcl lco leb lec lee leh lel leo lhb lhc lhh lho llb llc lle lll llo lob loc loe loh lol loo ob- obb obc obe obh obl obo oc- ocb occ och ocl oco oeb oec oee oeh oel oeo ohc ohe ohh ohl oho olb olc ole oll olo oo- oob ooc ooh ool ooo