-er -ic b-u bbb bbc bbe bbi bbo bbr bbs bbt bbu bcb bcc bce bci bco bcr bcs bct bcu be- beb bec bee bei beo ber bes bet beu bi- bib bic bie bii bio bir bis bit biu bob boc boe boi boo bor bos bot bou brb bre bri bro brr brs brt bru bsb bsc bse bsi bso bsr bss bst bsu btb btc bte bti bto btr bts btt btu bub buc bue bui buo bur bus but buu c-- cbb cbc cbe cbi cbo cbr cbs cbt cbu ccb ccc cce cci cco ccr ccs cct ccu ce- ceb cec cee cei ceo cer ces cet ceu ci- cib cic cie cii cio cir cis cit ciu co- cob coc coe coi coo cor cos cot cou crb crc cre cri cro crr crs crt cru csb csc cse csi cso csr css cst csu ctb ctc cte cti cto ctr cts ctt ctu cub cuc cue cui cuo cur cus cut cuu ebb ebc ebe ebi ebo ebr ebs ebt ebu ec- ecb ecc ece eci eco ecr ecs ect ecu eeb eec eee eeo eer ees eet eib eic eie eii eio eir eis eit eiu eo- eob eoc eoe eoi eoo eor eos eot eou erb erc ere eri ero err ers ert eru es- esb esc ese esi eso esr ess est esu etb etc ete eti eto etr ets ett etu eu- eub euc eue eui eur eus eut ibb ibc ibe ibi ibo ibr ibs ibt ibu icb icc ice ici ico icr ics ict icu ie- iec iee iei ier ies iet iib iic iie iii iio iir iis iit iiu io- iob ioc ioe ioi ioo ior ios iot iou ir- irb irc ire iri iro irr irs irt iru is- isb isc ise isi iso isr iss ist isu itb itc ite iti ito its itt itu iu- iub iuc iue iui iur ius iut o-i ob- obb obc obe obi obo obr obs obt obu oc- ocb occ oci oco ocr ocs oct ocu oeb oec oee oei oeo oer oes oet oib oic oie oii oio oir ois oit oiu oo- oob ooc ooi ooo oor oos oot or- orb orc ore ori oro orr ors ort oru os- osb osc ose osi oso osr oss ost osu ot- otb otc ote oti oto otr ots ott otu ou- ouc oue oui ouo our ous out rbb rbc rbe rbi rbo rbr rbs rbt rbu rcb rcc rce rci rco rcr rcs rct rcu re- reb rec ree rei reo rer res ret reu rib ric rie rii rio rir ris rit rob roc roe roi roo ror ros rot rou rrb rrc rri rrr rrs rrt rru rsb rsc rse rsi rso rsr rss rst rsu rtb rtc rte rti rto rtr rts rtt rtu rub ruc rue rui ruo rur rus rut ruu sbb sbc sbe sbi sbo sbr sbs sbt sbu scb scc sce sci sco scr scs sct scu se- seb sec see sei seo ser ses set seu sib sic sie sii sio sir sis sit siu sob soc soe soi soo sor sos sot sou sr- srb src sre sri sro srr srs srt ss- ssb ssc sse ssi sso ssr sss sst ssu stb stc ste sti sto str sts stt stu sub suc sue sui suo sur sus sut suu tbb tbc tbe tbi tbo tbr tbs tbt tbu tcb tcc tce tci tco tcr tcs tct tcu te- teb tec tee tei teo ter tes tet teu tib tic tie tii tio tir tis tit tiu to- tob toc toe toi too tor tos tot tou trb trc tre tri tro trr trs trt tru tsb tsc tse tsi tso tsr tss tst tsu ttb ttc tte tti tto ttr tts ttt ttu tub tuc tue tui tuo tur tus tut tuu ubb ubc ube ubi ubo ubr ubs ubt ubu ucb ucc uce uci uco ucr ucs uct ucu ueb uec uee uei uer ues uet uib uic uie uii uio uir uis uit uiu uob uoc uoe uoo uor uos uot ur- urb urc ure uri uro urr urs urt uru usb usc use usi uso usr uss ust usu utb utc ute uti uto utr uts utt utu uuc uue uur uus uut uuu