-er -ic a-a a-b a-c a-i aaa aab aac aae aag aai aar aau ab- aba abb abc abe abg abi abr abu ac- aca acb acc ace acg aci acr acu aea aeb aec aee aeg aei aer aeu ag- aga agb agc age agg agi agr agu ai- aia aib aic aie aig aii air aiu ar- ara arb arc are arg ari arr aru au- aua aub auc aue aug aui aur b-u baa bab bac bae bag bai bar bau bba bbb bbc bbe bbg bbi bbr bbu bca bcb bcc bce bcg bci bcr bcu be- bea beb bec bee beg bei ber beu bga bgb bgc bge bgg bgi bgr bgu bi- bia bib bic bie big bii bir biu bra brb bre brg bri brr bru bua bub buc bue bug bui bur buu c-- caa cab cac cae cag cai car cau cba cbb cbc cbe cbg cbi cbr cbu cca ccb ccc cce ccg cci ccr ccu ce- cea ceb cec cee ceg cei cer ceu cga cgb cgc cge cgg cgi cgr cgu ci- cia cib cic cie cig cii cir ciu cra crb crc cre crg cri crr cru cua cub cuc cue cug cui cur cuu eaa eab eac eae eag eai ear eau eba ebb ebc ebe ebg ebi ebr ebu ec- eca ecb ecc ece ecg eci ecr ecu eea eeb eec eee eeg eer ega egb egc ege egg egi egr egu eia eib eic eie eig eii eir eiu era erb erc ere erg eri err eru eu- eua eub euc eue eug eui eur gaa gab gac gae gag gai gar gau gba gbc gbe gbg gbi gbr gbu gca gcb gcc gce gcg gci gcr gcu ge- gea geb gec gee geg gei ger geu gga ggb ggc ggg ggi ggr ggu gia gib gic gie gig gii gir giu gra grb grc gre grg gri grr gru gu- gua gub guc gue gug gui gur guu ia- iaa iab iac iae iag iai iar iau iba ibb ibc ibe ibg ibi ibr ibu ica icb icc ice icg ici icr icu ie- iea iec iee ieg iei ier iga igb igc ige igg igi igr igu iia iib iic iie iii iir iiu ir- ira irb irc ire irg iri irr iru iu- iua iub iuc iue iug iui iur ra- raa rab rac rae rag rai rar rau rba rbb rbc rbe rbg rbi rbr rbu rca rcb rcc rce rcg rci rcr rcu re- rea reb rec ree reg rei rer reu rga rgb rgc rge rgg rgi rgr ria rib ric rie rig rii rir rra rrb rrc rrg rri rrr rru rua rub ruc rue rug rui rur ruu ua- uaa uab uac uae uag uai uar uau uba ubb ubc ube ubg ubi ubr ubu uca ucb ucc uce ucg uci ucr ucu uea ueb uec uee ueg uei uer uga ugb ugc uge ugg ugi ugr ugu uia uib uic uie uig uii uir uiu ur- ura urb urc ure urg uri urr uru uua uuc uue uug uur uuu