-er a-a a-b a-i aaa aab aae aag aai aap aar aas ab- aba abb abe abg abi abp abr abs aea aeb aee aeg aei aep aer aes ag- aga agb age agg agi agp agr ags ai- aia aib aie aig aii aip air ais ap- apa apb ape apg api app apr aps ar- ara arb are arg ari arp arr ars as- asa asb ase asg asi asp asr ass b-p baa bab bae bag bai bap bar bas bba bbb bbe bbg bbi bbp bbr bbs be- bea beb bee beg bei bep ber bes bga bgb bge bgg bgi bgp bgr bgs bi- bia bib bie big bii bip bir bis bpa bpb bpe bpg bpi bpp bpr bps bra brb bre brg bri brp brr brs bsa bsb bse bsg bsi bsp bsr bss eaa eab eae eag eai eap ear eas eba ebb ebe ebg ebi ebp ebr ebs eea eeb eee eeg eep eer ees ega egb ege egg egi egp egr egs eia eib eie eig eii eip eir eis ep- epa epb epe epg epi epp epr eps era erb ere erg eri erp err ers es- esa esb ese esg esi esp esr ess g-p gaa gab gae gag gai gap gar gas gba gbe gbg gbi gbp gbr gbs ge- gea geb gee geg gei gep ger ges gga ggb ggg ggi ggp ggr ggs gia gib gie gig gii gip gir gis gpa gpb gpe gpg gpi gpp gpr gps gra grb gre grg gri grp grr grs gsa gsb gse gsg gsi gsp gsr gss ia- iaa iab iae iag iai iap iar ias iba ibb ibe ibg ibi ibp ibr ibs ie- iea iee ieg iei iep ier ies iga igb ige igg igi igp igr igs iia iib iie iii iip iir iis ipa ipb ipe ipg ipi ipp ipr ips ir- ira irb ire irg iri irp irr irs is- isa isb ise isg isi isp isr iss p-p paa pab pae pag pai pap par pas pba pbb pbe pbg pbi pbp pbr pbs pea peb pee peg pei pep per pes pga pgb pge pgg pgi pgp pgr pgs pia pib pie pig pii pip pir pis ppa ppb ppe ppg ppi ppp ppr pps pra prb pre prg pri prp prr prs ps- psa psb pse psg psi psp psr pss ra- raa rab rae rag rai rap rar ras rba rbb rbe rbg rbi rbp rbr rbs re- rea reb ree reg rei rep rer res rga rgb rge rgg rgi rgp rgr rgs ria rib rie rig rii rip rir ris rpa rpb rpe rpg rpi rpp rpr rps rra rrb rrg rri rrp rrr rrs rsa rsb rse rsg rsi rsp rsr rss saa sab sae sag sai sap sar sas sba sbb sbe sbg sbi sbp sbr sbs se- sea seb see seg sei sep ser ses sga sgb sge sgg sgi sgp sgr sgs sia sib sie sig sii sip sir sis spa spb spe spg spi spp spr sps sr- sra srb sre srg sri srp srr srs ss- ssa ssb sse ssg ssi ssp ssr sss