-er bbb bbc bbe bbh bbn bbo bbr bbx bcb bcc bce bch bcn bco bcr bcx be- beb bec bee beh ben beo ber bex bhb bhc bhe bhh bho bhr bhx bnb bnc bne bnn bno bnr bnx bob boc boe boh bon boo bor box brb bre brh brn bro brr brx bxb bxn bxo bxx c-- cbb cbc cbe cbh cbn cbo cbr cbx ccb ccc cce cch ccn cco ccr ccx ce- ceb cec cee ceh cen ceo cer cex ch- chb chc che chh chn cho chr chx cn- cnb cnc cne cnh cnn cno cnr cnx co- cob coc coe coh con coo cor cox crb crc cre crh crn cro crr crx cxc cxh cxo cxr cxx ebb ebc ebe ebh ebn ebo ebr ebx ec- ecb ecc ece ech ecn eco ecr ecx eeb eec eee een eeo eer eex ehb ehc ehe ehh ehn eho ehr en- enb enc ene enh enn eno enr eo- eob eoc eoe eoh eon eoo eor erb erc ere erh ern ero err ex- exc exe exh exo exr exx hbb hbc hbe hbh hbn hbo hbr hbx hcb hcc hce hch hcn hco hcr he- heb hec hee heh hen heo her hex hhb hhc hhe hhh hhn hho hhr hnb hnc hne hnh hnn hno hob hoc hoe hoh hon hoo hor hox hr- hrb hrc hre hrh hrn hro hrr hxc nbb nbc nbe nbn nbo nbr nbx ncb ncc nce nch ncn nco ncr ncx ne- neb nec nee neh nen neo ner nex nhb nhc nhe nhh nhn nhr nnb nnc nne nnh nnn nno no- nob noc noe noh non noo nor nox nrb nrc nre nrn nro nrr nrx nxc ob- obb obc obe obh obn obo obr obx oc- ocb occ och ocn oco ocr ocx oeb oec oee oeh oen oeo oer oex ohc ohe ohh ohn oho ohr on- onb onc one onh onn ono onr onx oo- oob ooc ooh oon ooo oor oox or- orb orc ore orh orn oro orr orx ox- oxb oxc oxn oxo oxx rbb rbc rbe rbh rbn rbo rbr rbx rcb rcc rce rch rcn rco rcr rcx re- reb rec ree reh ren reo rer rex rh- rhb rhc rhe rhh rhn rho rhr rnb rnc rnh rnn rno rnr rob roc roe roh ron roo ror rox rrb rrc rrh rrn rrr rxr xbc xbe xbr xbx xcb xch xcr xcx xee xen xer xex xnc xno xoc xon xoo xor xox xrc xrx xxo xxx