-er -ic a-a a-c a-i a-t aaa aac aae aaf aag aai aar aat ac- aca acc ace acf acg aci acr act aea aec aee aef aeg aei aer aet af- afa afc afe aff afg afi afr aft ag- aga agc age agf agg agi agr agt ai- aia aic aie aif aig aii air ait ar- ara arc are arf arg ari arr art at- ata atc ate atf atg ati atr att c-- caa cac cae caf cag cai car cat cca ccc cce ccf ccg cci ccr cct ce- cea cec cee cef ceg cei cer cet cfa cfc cfe cff cfg cfi cfr cft cga cgc cge cgg cgi cgr cgt ci- cia cic cie cif cig cii cir cit cra crc cre crf crg cri crr crt cta ctc cte ctf ctg cti ctr ctt eaa eac eae eaf eag eai ear eat ec- eca ecc ece ecf ecg eci ecr ect eea eec eee eef eeg eer eet ef- efa efc efe eff efg efi efr eft ega egc ege egf egg egi egr egt eia eic eie eif eig eii eir eit era erc ere erf erg eri err ert eta etc ete etf etg eti etr ett faa fac fae faf fag fai far fat fca fcc fce fcf fcg fci fcr fct fea fec fee fef feg fei fer fet ffa ffc ffe fff ffg ffi ffr fft fga fgc fge fgf fgg fgi fgr fgt fia fic fie fif fig fii fir fit fra frc fre frf frg fri frr frt fta ftc fte ftf ftg fti ftr ftt gaa gac gae gaf gag gai gar gat gca gcc gce gcf gcg gci gcr gct ge- gea gec gee gef geg gei ger get gfa gfc gfe gff gfi gfr gft gga ggc ggg ggi ggr ggt gia gic gie gif gig gii gir git gra grc gre grf grg gri grr grt gta gtc gte gtf gtg gti gtr gtt i-f ia- iaa iac iae iaf iag iai iar iat ica icc ice icf icg ici icr ict ie- iea iec iee ief ieg iei ier iet ifa ifc ife iff ifg ifi ifr ift iga igc ige igf igg igi igr igt iia iic iie iif iii iir iit ir- ira irc ire irf irg iri irr irt ita itc ite itf itg iti itt ra- raa rac rae raf rag rai rar rat rca rcc rce rcf rcg rci rcr rct re- rea rec ree ref reg rei rer ret rfa rfc rfe rff rfg rfi rfr rft rga rgc rge rgf rgg rgi rgr rgt ria ric rie rif rig rii rir rit rra rrc rrf rrg rri rrr rrt rta rtc rte rtf rtg rti rtr rtt taa tac tae taf tag tai tar tat tca tcc tce tcf tcg tci tcr tct te- tea tec tee tef teg tei ter tet tfa tfc tfe tff tfg tfi tfr tft tga tgc tge tgf tgg tgi tgr tgt tia tic tie tif tig tii tir tit tra trc tre trf trg tri trr trt tta ttc tte ttf ttg tti ttr ttt