-er -ic a-a a-b a-c a-i aaa aab aac aae aag aai aan aar ab- aba abb abc abe abg abi abn abr ac- aca acb acc ace acg aci acn acr aea aeb aec aee aeg aei aen aer ag- aga agb agc age agg agi agn agr ai- aia aib aic aie aig aii ain air an- ana anb anc ane ang ani ann anr ar- ara arb arc are arg ari arn arr baa bab bac bae bag bai ban bar bba bbb bbc bbe bbg bbi bbn bbr bca bcb bcc bce bcg bci bcn bcr be- bea beb bec bee beg bei ben ber bga bgb bgc bge bgg bgi bgn bgr bi- bia bib bic bie big bii bin bir bna bnb bnc bne bng bni bnn bnr bra brb bre brg bri brn brr c-- caa cab cac cae cag cai can car cba cbb cbc cbe cbg cbi cbn cbr cca ccb ccc cce ccg cci ccn ccr ce- cea ceb cec cee ceg cei cen cer cga cgb cgc cge cgg cgi cgn cgr ci- cia cib cic cie cig cii cin cir cn- cna cnb cnc cne cng cni cnn cnr cra crb crc cre crg cri crn crr eaa eab eac eae eag eai ean ear eba ebb ebc ebe ebg ebi ebn ebr ec- eca ecb ecc ece ecg eci ecn ecr eea eeb eec eee eeg een eer ega egb egc ege egg egi egn egr eia eib eic eie eig eii ein eir en- ena enb enc ene eng eni enn enr era erb erc ere erg eri ern err gaa gab gac gae gag gai gan gar gba gbc gbe gbg gbi gbn gbr gca gcb gcc gce gcg gci gcn gcr ge- gea geb gec gee geg gei gen ger gga ggb ggc ggg ggi ggn ggr gia gib gic gie gig gii gin gir gna gnb gnc gne gni gnn gnr gra grb grc gre grg gri grn grr ia- iaa iab iac iae iag iai ian iar iba ibb ibc ibe ibg ibi ibn ibr ica icb icc ice icg ici icn icr ie- iea iec iee ieg iei ien ier iga igb igc ige igg igi ign igr iia iib iic iie iii iin iir in- ina inb inc ine ing ini inn inr ir- ira irb irc ire irg iri irn irr n-i naa nab nac nae nag nai nan nar nba nbb nbc nbe nbg nbi nbn nbr nca ncb ncc nce ncg nci ncn ncr ne- nea neb nec nee neg nei nen ner nga ngb ngc nge ngg ngi ngn nia nib nic nie nig nii nin nir nna nnb nnc nne nng nni nnn nra nrb nrc nre nrg nri nrn nrr ra- raa rab rac rae rag rai ran rar rba rbb rbc rbe rbg rbi rbn rbr rca rcb rcc rce rcg rci rcn rcr re- rea reb rec ree reg rei ren rer rga rgb rgc rge rgg rgi rgn rgr ria rib ric rie rig rii rin rir rna rnb rnc rng rni rnn rnr rra rrb rrc rrg rri rrn rrr