-er -ic b-u bbb bbc bbe bbg bbi bbr bbu bcb bcc bce bcg bci bcr bcu bcv be- beb bec bee beg bei ber beu bev bgb bgc bge bgg bgi bgr bgu bgv bi- bib bic bie big bii bir biu biv brb bre brg bri brr bru brv bub buc bue bug bui bur buu bvb bvc bve bvg bvi bvr bvu bvv c-- cbb cbc cbe cbg cbi cbr cbu cbv ccb ccc cce ccg cci ccr ccu ccv ce- ceb cec cee ceg cei cer ceu cev cgb cgc cge cgg cgi cgr cgu cgv ci- cib cic cie cig cii cir ciu civ crb crc cre crg cri crr cru crv cub cuc cue cug cui cur cuu cuv cvb cvc cve cvg cvi cvr cvu cvv ebb ebc ebe ebg ebi ebr ebu ebv ec- ecb ecc ece ecg eci ecr ecu ecv eeb eec eee eeg eer eev egb egc ege egg egi egr egu eib eic eie eig eii eir eiu eiv erb erc ere erg eri err eru erv eu- eub euc eue eug eui eur euv evb evc eve evg evi evr evv gbc gbe gbg gbi gbr gbu gbv gcb gcc gce gcg gci gcr gcu ge- geb gec gee geg gei ger geu gev ggb ggc ggg ggi ggr ggu ggv gib gic gie gig gii gir giu giv grb grc gre grg gri grr gru grv gu- gub guc gue gug gui gur guu guv gvb gvc gve gvg gvi gvr gvu i-v ibb ibc ibe ibg ibi ibr ibu ibv icb icc ice icg ici icr icu icv ie- iec iee ieg iei ier iev igb igc ige igg igi igr igu iib iic iie iii iir iiu ir- irb irc ire irg iri irr iru irv iu- iub iuc iue iug iui iur ivb ivc ive ivg ivi ivr ivu ivv rbb rbc rbe rbg rbi rbr rbu rcb rcc rce rcg rci rcr rcu rcv re- reb rec ree reg rei rer reu rev rgb rgc rge rgg rgi rgr rgv rib ric rie rig rii rir riv rrb rrc rrg rri rrr rru rub ruc rue rug rui rur ruu ruv rvb rvc rve rvg rvi rvr rvu rvv ubb ubc ube ubg ubi ubr ubu ubv ucb ucc uce ucg uci ucr ucu ucv ueb uec uee ueg uei uer ugb ugc uge ugg ugi ugr ugu uib uic uie uig uii uir uiu ur- urb urc ure urg uri urr uru uuc uue uug uur uuu uvb uvc uve uvu uvv v-e vbc vbg vbi vbr vbv vcc vce vci vcr vcu veb vec vee veg vei ver veu vgc vgg vgr vgu vi- vib vic vie vig vii vir viu viv vrb vrc vre vrg vri vrr vru vue vug vur vuv vvb vvc vvg vvi vvr vvv