-er -ol bbb bbc bbe bbh bbl bbo bbr bcb bcc bce bch bcl bco bcr be- beb bec bee beh bel beo ber bhb bhc bhe bhh bhl bho bhr blb blc ble blh bll blo blr bob boc boe boh bol boo bor brb bre brh brl bro brr c-- cbb cbc cbe cbh cbl cbo cbr ccb ccc cce cch ccl cco ccr ce- ceb cec cee ceh cel ceo cer ch- chb chc che chh chl cho chr cl- clb clc cle clh cll clo clr co- cob coc coe coh col coo cor crb crc cre crh crl cro crr ebb ebc ebe ebh ebl ebo ebr ec- ecb ecc ece ech ecl eco ecr eeb eec eee eel eeo eer ehb ehc ehe ehh ehl eho ehr elb elc ele elh ell elo elr eo- eob eoc eoe eoh eol eoo eor erb erc ere erh erl ero err hbb hbc hbe hbh hbl hbo hbr hcb hcc hce hch hcl hco hcr he- heb hec hee heh hel heo her hhb hhc hhe hhh hhl hho hhr hlb hlc hle hlh hll hlo hlr hob hoc hoe hoh hol hoo hor hr- hrb hrc hre hrh hrl hro hrr lbb lbc lbe lbh lbl lbo lbr lcb lcc lce lch lcl lco lcr leb lec lee leh lel leo ler lhb lhc lhh lho lhr llb llc lle lll llo llr lob loc loe loh lol loo lor lrb lrc lrh lro lrr ob- obb obc obe obh obl obo obr oc- ocb occ och ocl oco ocr oeb oec oee oeh oel oeo oer ohc ohe ohh ohl oho ohr olb olc ole oll olo oo- oob ooc ooh ool ooo oor or- orb orc ore orh orl oro orr rbb rbc rbe rbh rbl rbo rbr rcb rcc rce rch rcl rco rcr re- reb rec ree reh rel reo rer rh- rhb rhc rhe rhh rhl rho rhr rlc rle rlh rll rlo rlr rob roc roe roh rol roo ror rrb rrc rrh rrl rrr