-er -ic b-u bbb bbc bbe bbg bbi bbr bbs bbt bbu bcb bcc bce bcg bci bcr bcs bct bcu be- beb bec bee beg bei ber bes bet beu bgb bgc bge bgg bgi bgr bgs bgt bgu bi- bib bic bie big bii bir bis bit biu brb bre brg bri brr brs brt bru bsb bsc bse bsg bsi bsr bss bst bsu btb btc bte btg bti btr bts btt btu bub buc bue bug bui bur bus but buu c-- cbb cbc cbe cbg cbi cbr cbs cbt cbu ccb ccc cce ccg cci ccr ccs cct ccu ce- ceb cec cee ceg cei cer ces cet ceu cgb cgc cge cgg cgi cgr cgs cgt cgu ci- cib cic cie cig cii cir cis cit ciu crb crc cre crg cri crr crs crt cru csb csc cse csg csi csr css cst csu ctb ctc cte ctg cti ctr cts ctt ctu cub cuc cue cug cui cur cus cut cuu ebb ebc ebe ebg ebi ebr ebs ebt ebu ec- ecb ecc ece ecg eci ecr ecs ect ecu eeb eec eee eeg eer ees eet egb egc ege egg egi egr egs egt egu eib eic eie eig eii eir eis eit eiu erb erc ere erg eri err ers ert eru es- esb esc ese esg esi esr ess est esu etb etc ete etg eti etr ets ett etu eu- eub euc eue eug eui eur eus eut gbc gbe gbg gbi gbr gbs gbt gbu gcb gcc gce gcg gci gcr gcs gct gcu ge- geb gec gee geg gei ger ges get geu ggb ggc ggg ggi ggr ggs ggt ggu gib gic gie gig gii gir gis git giu grb grc gre grg gri grr grs grt gru gsb gsc gse gsg gsi gsr gss gst gsu gtb gtc gte gtg gti gtr gts gtt gtu gu- gub guc gue gug gui gur gus gut guu ibb ibc ibe ibg ibi ibr ibs ibt ibu icb icc ice icg ici icr ics ict icu ie- iec iee ieg iei ier ies iet igb igc ige igg igi igr igs igt igu iib iic iie iii iir iis iit iiu ir- irb irc ire irg iri irr irs irt iru is- isb isc ise isg isi isr iss ist isu itb itc ite itg iti its itt itu iu- iub iuc iue iug iui iur ius iut rbb rbc rbe rbg rbi rbr rbs rbt rbu rcb rcc rce rcg rci rcr rcs rct rcu re- reb rec ree reg rei rer res ret reu rgb rgc rge rgg rgi rgr rgs rgt rib ric rie rig rii rir ris rit rrb rrc rrg rri rrr rrs rrt rru rsb rsc rse rsg rsi rsr rss rst rsu rtb rtc rte rtg rti rtr rts rtt rtu rub ruc rue rug rui rur rus rut ruu sbb sbc sbe sbg sbi sbr sbs sbt sbu scb scc sce scg sci scr scs sct scu se- seb sec see seg sei ser ses set seu sgb sgc sge sgg sgi sgr sgs sgt sgu sib sic sie sig sii sir sis sit siu sr- srb src sre srg sri srr srs srt ss- ssb ssc sse ssg ssi ssr sss sst ssu stb stc ste stg sti str sts stt stu sub suc sue sug sui sur sus sut suu tbb tbc tbe tbg tbi tbr tbs tbt tbu tcb tcc tce tcg tci tcr tcs tct tcu te- teb tec tee teg tei ter tes tet teu tgb tgc tge tgg tgi tgr tgs tgt tgu tib tic tie tig tii tir tis tit tiu trb trc tre trg tri trr trs trt tru tsb tsc tse tsg tsi tsr tss tst tsu ttb ttc tte ttg tti ttr tts ttt ttu tub tuc tue tug tui tur tus tut tuu ubb ubc ube ubg ubi ubr ubs ubt ubu ucb ucc uce ucg uci ucr ucs uct ucu ueb uec uee ueg uei uer ues uet ugb ugc uge ugg ugi ugr ugs ugt ugu uib uic uie uig uii uir uis uit uiu ur- urb urc ure urg uri urr urs urt uru usb usc use usg usi usr uss ust usu utb utc ute uti utr uts utt utu uuc uue uug uur uus uut uuu