-er -ic b-u bbb bbc bbe bbg bbi bbl bbr bbu bcb bcc bce bcg bci bcl bcr bcu be- beb bec bee beg bei bel ber beu bgb bgc bge bgg bgi bgl bgr bgu bi- bib bic bie big bii bil bir biu blb blc ble blg bli bll blr blu brb bre brg bri brl brr bru bub buc bue bug bui bul bur buu c-- cbb cbc cbe cbg cbi cbl cbr cbu ccb ccc cce ccg cci ccl ccr ccu ce- ceb cec cee ceg cei cel cer ceu cgb cgc cge cgg cgi cgl cgr cgu ci- cib cic cie cig cii cil cir ciu cl- clb clc cle clg cli cll clr clu crb crc cre crg cri crl crr cru cub cuc cue cug cui cul cur cuu ebb ebc ebe ebg ebi ebl ebr ebu ec- ecb ecc ece ecg eci ecl ecr ecu eeb eec eee eeg eel eer egb egc ege egg egi egl egr egu eib eic eie eig eii eil eir eiu elb elc ele elg eli ell elr elu erb erc ere erg eri erl err eru eu- eub euc eue eug eui eul eur gbc gbe gbg gbi gbl gbr gbu gcb gcc gce gcg gci gcl gcr gcu ge- geb gec gee geg gei gel ger geu ggb ggc ggg ggi ggr ggu gib gic gie gig gii gil gir giu glb glc gle glg gli gll glr glu grb grc gre grg gri grl grr gru gu- gub guc gue gug gui gul gur guu ibb ibc ibe ibg ibi ibl ibr ibu icb icc ice icg ici icl icr icu ie- iec iee ieg iei iel ier igb igc ige igg igi igl igr igu iib iic iie iii iil iir iiu il- ilb ilc ile ilg ili ill ilr ilu ir- irb irc ire irg iri irl irr iru iu- iub iuc iue iug iui iur lbb lbc lbe lbg lbi lbl lbr lbu lcb lcc lce lcg lci lcl lcr lcu leb lec lee leg lei lel ler leu lgb lgc lge lgg lgi lgl lgr lgu lib lic lie lig lii lil lir liu llb llc lle llg lli lll llr llu lrb lrc lrg lri lrr lru lub luc lue lug lui lul lur luu rbb rbc rbe rbg rbi rbl rbr rbu rcb rcc rce rcg rci rcl rcr rcu re- reb rec ree reg rei rel rer reu rgb rgc rge rgg rgi rgr rib ric rie rig rii ril rir rlc rle rlg rli rll rlr rlu rrb rrc rrg rri rrl rrr rru rub ruc rue rug rui rur ruu ubb ubc ube ubg ubi ubl ubr ubu ucb ucc uce ucg uci ucl ucr ucu ueb uec uee ueg uei uel uer ugb ugc uge ugg ugi ugl ugr ugu uib uic uie uig uii uil uir uiu ulb ulc ule ulg uli ull ulr ulu ur- urb urc ure urg uri url urr uru uuc uue uug uur uuu