-er -ey b-u bbb bbc bbe bbg bbr bbs bbu bby bcb bcc bce bcg bcr bcs bcu bcy be- beb bec bee beg ber bes beu bey bgb bgc bge bgg bgr bgs bgu brb bre brg brr brs bru bry bsb bsc bse bsg bsr bss bsu bsy bub buc bue bug bur bus buu buy by- byc bye byg byr bys byu c-- cbb cbc cbe cbg cbr cbs cbu cby ccb ccc cce ccg ccr ccs ccu ce- ceb cec cee ceg cer ces ceu cey cgb cgc cge cgg cgr cgs cgu cgy crb crc cre crg crr crs cru cry csb csc cse csg csr css csu csy cub cuc cue cug cur cus cuu cuy cyb cyc cye cyg cyr cys ebb ebc ebe ebg ebr ebs ebu eby ec- ecb ecc ece ecg ecr ecs ecu eeb eec eee eeg eer ees eey egb egc ege egg egr egs egu egy erb erc ere erg err ers eru ery es- esb esc ese esg esr ess esu esy eu- eub euc eue eug eur eus eyc eye eyr eys gbc gbe gbg gbr gbs gbu gby gcb gcc gce gcg gcr gcs gcu ge- geb gec gee geg ger ges geu gey ggb ggc ggg ggr ggs ggu grb grc gre grg grr grs gru gry gsb gsc gse gsg gsr gss gsu gu- gub guc gue gug gur gus guu guy gy- gyb gye gyr gys rbb rbc rbe rbg rbr rbs rbu rcb rcc rce rcg rcr rcs rcu re- reb rec ree reg rer res reu rey rgb rgc rge rgg rgr rgs rrb rrc rrg rrr rrs rru rsb rsc rse rsg rsr rss rsu rub ruc rue rug rur rus ruu ruy ry- ryc rye ryg ryr rys ryu ryy sbb sbc sbe sbg sbr sbs sbu sby scb scc sce scg scr scs scu se- seb sec see seg ser ses seu sey sgb sgc sge sgg sgr sgs sgu sr- srb src sre srg srr srs sry ss- ssb ssc sse ssg ssr sss ssu sub suc sue sug sur sus suu suy sy- syb syc sye syg syr sys syu ubb ubc ube ubg ubr ubs ubu uby ucb ucc uce ucg ucr ucs ucu ueb uec uee ueg uer ues uey ugb ugc uge ugg ugr ugs ugu ur- urb urc ure urg urr urs uru ury usb usc use usg usr uss usu uuc uue uug uur uus uuu uyc uys uyu ybc ybe ybg ybr ybs yby ycc yce ycs ycu ycy yeb yec yee yeg yer yes yey ygc yrc yre yrg yrs yru ysb ysc yse ysg ysr yss ysu ysy yue yug yur yus yuu yuy yyb yyc yye yyg yys yyu yyy