-er -ic a-a a-b a-c a-i aaa aab aac aae aag aai aar ab- aba abb abc abe abg abi abr ac- aca acb acc ace acg aci acr aea aeb aec aee aeg aei aer ag- aga agb agc age agg agi agr ai- aia aib aic aie aig aii air ar- ara arb arc are arg ari arr baa bab bac bae bag bai bar bba bbb bbc bbe bbg bbi bbr bca bcb bcc bce bcg bci bcr be- bea beb bec bee beg bei ber bga bgb bgc bge bgg bgi bgr bi- bia bib bic bie big bii bir bra brb bre brg bri brr c-- caa cab cac cae cag cai car cba cbb cbc cbe cbg cbi cbr cca ccb ccc cce ccg cci ccr ce- cea ceb cec cee ceg cei cer cga cgb cgc cge cgg cgi cgr ci- cia cib cic cie cig cii cir cra crb crc cre crg cri crr eaa eab eac eae eag eai ear eba ebb ebc ebe ebg ebi ebr ec- eca ecb ecc ece ecg eci ecr eea eeb eec eee eeg eer ega egb egc ege egg egi egr eia eib eic eie eig eii eir era erb erc ere erg eri err gaa gab gac gae gag gai gar gba gbc gbe gbg gbi gbr gca gcb gcc gce gcg gci gcr ge- gea geb gec gee geg gei ger gga ggb ggc ggg ggi ggr gia gib gic gie gig gii gir gra grb grc gre grg gri grr ia- iaa iab iac iae iag iai iar iba ibb ibc ibe ibg ibi ibr ica icb icc ice icg ici icr ie- iea iec iee ieg iei ier iga igb igc ige igg igi igr iia iib iic iie iii iir ir- ira irb irc ire irg iri irr ra- raa rab rac rae rag rai rar rba rbb rbc rbe rbg rbi rbr rca rcb rcc rce rcg rci rcr re- rea reb rec ree reg rei rer rga rgb rgc rge rgg rgi rgr ria rib ric rie rig rii rir rra rrb rrc rrg rri rrr