-er -ic b-u bbb bbc bbe bbf bbi bbo bbr bbs bbu bcb bcc bce bcf bci bco bcr bcs bcu be- beb bec bee bef bei beo ber bes beu bfb bfc bfe bff bfi bfo bfr bfs bfu bi- bib bic bie bif bii bio bir bis biu bob boc boe bof boi boo bor bos bou brb bre brf bri bro brr brs bru bsb bsc bse bsf bsi bso bsr bss bsu bub buc bue buf bui buo bur bus buu c-- cbb cbc cbe cbf cbi cbo cbr cbs cbu ccb ccc cce ccf cci cco ccr ccs ccu ce- ceb cec cee cef cei ceo cer ces ceu cfb cfc cfe cff cfi cfo cfr cfs cfu ci- cib cic cie cif cii cio cir cis ciu co- cob coc coe cof coi coo cor cos cou crb crc cre crf cri cro crr crs cru csb csc cse csf csi cso csr css csu cub cuc cue cuf cui cuo cur cus cuu ebb ebc ebe ebf ebi ebo ebr ebs ebu ec- ecb ecc ece ecf eci eco ecr ecs ecu eeb eec eee eef eeo eer ees ef- efb efc efe eff efi efo efr efs eib eic eie eif eii eio eir eis eiu eo- eob eoc eoe eof eoi eoo eor eos eou erb erc ere erf eri ero err ers eru es- esb esc ese esf esi eso esr ess esu eu- eub euc eue euf eui eur eus fbb fbc fbe fbf fbi fbo fbr fbs fbu fcb fcc fce fcf fci fco fcr fcs fcu feb fec fee fef fei feo fer fes feu ffc ffe fff ffi ffo ffr ffs ffu fib fic fie fif fii fir fis fiu fob foc foe fof foi foo for fos fou frb frc fre frf fri fro frr frs fru fsb fsc fse fsf fsi fso fsr fss fsu fub fue fuf fui fuo fur fus fuu i-f ibb ibc ibe ibf ibi ibo ibr ibs ibu icb icc ice icf ici ico icr ics icu ie- iec iee ief iei ier ies ifb ifc ife iff ifi ifo ifr ifs ifu iib iic iie iif iii iio iir iis iiu io- iob ioc ioe iof ioi ioo ior ios iou ir- irb irc ire irf iri iro irr irs iru is- isb isc ise isf isi iso isr iss isu iu- iub iuc iue iui iur ius o-i ob- obb obc obe obf obi obo obr obs obu oc- ocb occ ocf oci oco ocr ocs ocu oeb oec oee oef oei oeo oer oes of- ofb ofc ofe off ofi ofo ofr ofs ofu oib oic oie oif oii oio oir ois oiu oo- oob ooc oof ooi ooo oor oos or- orb orc ore orf ori oro orr ors oru os- osb osc ose osf osi oso osr oss osu ou- ouc oue ouf oui ouo our ous rbb rbc rbe rbf rbi rbo rbr rbs rbu rcb rcc rce rcf rci rco rcr rcs rcu re- reb rec ree ref rei reo rer res reu rfb rfc rfe rff rfi rfo rfr rfs rfu rib ric rie rif rii rio rir ris rob roc roe rof roi roo ror ros rou rrb rrc rrf rri rrr rrs rru rsb rsc rse rsf rsi rso rsr rss rsu rub ruc rue ruf rui ruo rur rus ruu sbb sbc sbe sbf sbi sbo sbr sbs sbu scb scc sce scf sci sco scr scs scu se- seb sec see sef sei seo ser ses seu sfb sfc sfe sff sfi sfo sfr sfs sfu sib sic sie sif sii sio sir sis siu sob soc soe sof soi soo sor sos sou sr- srb src sre srf sri sro srr srs ss- ssb ssc sse ssf ssi sso ssr sss ssu sub suc sue suf sui suo sur sus suu ubb ubc ube ubf ubi ubo ubr ubs ubu ucb ucc uce ucf uci uco ucr ucs ucu ueb uec uee uef uei uer ues ufc ufe uff ufi ufo ufr ufs ufu uib uic uie uif uii uio uir uis uiu uob uoc uoe uoo uor uos ur- urb urc ure urf uri uro urr urs uru usb usc use usf usi uso usr uss usu uuc uue uur uus uuu