-er -ic a-a a-b a-c a-i aaa aab aac aae aag aai aap aar ab- aba abb abc abe abg abi abp abr ac- aca acb acc ace acg aci acp acr aea aeb aec aee aeg aei aep aer ag- aga agb agc age agg agi agp agr ai- aia aib aic aie aig aii aip air ap- apa apb apc ape apg api app apr ar- ara arb arc are arg ari arp arr b-p baa bab bac bae bag bai bap bar bba bbb bbc bbe bbg bbi bbp bbr bca bcb bcc bce bcg bci bcp bcr be- bea beb bec bee beg bei bep ber bga bgb bgc bge bgg bgi bgp bgr bi- bia bib bic bie big bii bip bir bpa bpb bpc bpe bpg bpi bpp bpr bra brb bre brg bri brp brr c-- caa cab cac cae cag cai cap car cba cbb cbc cbe cbg cbi cbp cbr cca ccb ccc cce ccg cci ccp ccr ce- cea ceb cec cee ceg cei cep cer cga cgb cgc cge cgg cgi cgp cgr ci- cia cib cic cie cig cii cip cir cpa cpb cpc cpe cpg cpi cpp cpr cra crb crc cre crg cri crp crr eaa eab eac eae eag eai eap ear eba ebb ebc ebe ebg ebi ebp ebr ec- eca ecb ecc ece ecg eci ecr eea eeb eec eee eeg eep eer ega egb egc ege egg egi egp egr eia eib eic eie eig eii eip eir ep- epa epb epc epe epg epi epp epr era erb erc ere erg eri erp err g-p gaa gab gac gae gag gai gap gar gba gbc gbe gbg gbi gbp gbr gca gcb gcc gce gcg gci gcp gcr ge- gea geb gec gee geg gei gep ger gga ggb ggc ggg ggi ggp ggr gia gib gic gie gig gii gip gir gpa gpb gpc gpe gpg gpi gpp gpr gra grb grc gre grg gri grp grr ia- iaa iab iac iae iag iai iap iar iba ibb ibc ibe ibg ibi ibp ibr ica icb icc ice icg ici icp icr ie- iea iec iee ieg iei iep ier iga igb igc ige igg igi igp igr iia iib iic iie iii iip iir ipa ipb ipc ipe ipg ipi ipp ipr ir- ira irb irc ire irg iri irp irr p-p paa pab pac pae pag pai pap par pba pbb pbc pbe pbg pbi pbp pbr pca pcb pcc pce pcg pci pcp pcr pea peb pec pee peg pei pep per pga pgb pgc pge pgg pgi pgp pgr pia pib pic pie pig pii pip pir ppa ppb ppc ppe ppg ppi ppp ppr pra prb prc pre prg pri prp prr ra- raa rab rac rae rag rai rap rar rba rbb rbc rbe rbg rbi rbp rbr rca rcb rcc rce rcg rci rcp rcr re- rea reb rec ree reg rei rep rer rga rgb rgc rge rgg rgi rgp rgr ria rib ric rie rig rii rip rir rpa rpb rpc rpe rpg rpi rpp rpr rra rrb rrc rrg rri rrp rrr