-er -ic a-a a-b a-c a-i a-t aaa aab aac aae aaf aai aar aat ab- aba abb abc abe abf abi abr abt ac- aca acb acc ace acf aci acr act aea aeb aec aee aef aei aer aet af- afa afb afc afe aff afi afr aft ai- aia aib aic aie aif aii air ait ar- ara arb arc are arf ari arr art at- ata atb atc ate atf ati atr att baa bab bac bae baf bai bar bat bba bbb bbc bbe bbf bbi bbr bbt bca bcb bcc bce bcf bci bcr bct be- bea beb bec bee bef bei ber bet bfa bfb bfc bfe bff bfi bfr bft bi- bia bib bic bie bif bii bir bit bra brb bre brf bri brr brt bta btb btc bte btf bti btr btt c-- caa cab cac cae caf cai car cat cba cbb cbc cbe cbf cbi cbr cbt cca ccb ccc cce ccf cci ccr cct ce- cea ceb cec cee cef cei cer cet cfa cfb cfc cfe cff cfi cfr cft ci- cia cib cic cie cif cii cir cit cra crb crc cre crf cri crr crt cta ctb ctc cte ctf cti ctr ctt eaa eab eac eae eaf eai ear eat eba ebb ebc ebe ebf ebi ebr ebt ec- eca ecb ecc ece ecf eci ecr ect eea eeb eec eee eef eer eet ef- efa efb efc efe eff efi efr eft eia eib eic eie eif eii eir eit era erb erc ere erf eri err ert eta etb etc ete etf eti etr ett faa fab fac fae faf fai far fat fba fbb fbc fbe fbf fbi fbr fbt fca fcb fcc fce fcf fci fcr fct fea feb fec fee fef fei fer fet ffa ffc ffe fff ffi ffr fft fia fib fic fie fif fii fir fit fra frb frc fre frf fri frr frt fta ftb ftc fte ftf fti ftr ftt i-f ia- iaa iab iac iae iaf iai iar iat iba ibb ibc ibe ibf ibi ibr ibt ica icb icc ice icf ici icr ict ie- iea iec iee ief iei ier iet ifa ifb ifc ife iff ifi ifr ift iia iib iic iie iif iii iir iit ir- ira irb irc ire irf iri irr irt ita itb itc ite itf iti itt ra- raa rab rac rae raf rai rar rat rba rbb rbc rbe rbf rbi rbr rbt rca rcb rcc rce rcf rci rcr rct re- rea reb rec ree ref rei rer ret rfa rfb rfc rfe rff rfi rfr rft ria rib ric rie rif rii rir rit rra rrb rrc rrf rri rrr rrt rta rtb rtc rte rtf rti rtr rtt taa tab tac tae taf tai tar tat tba tbb tbc tbe tbf tbi tbr tbt tca tcb tcc tce tcf tci tcr tct te- tea teb tec tee tef tei ter tet tfa tfb tfc tfe tff tfi tfr tft tia tib tic tie tif tii tir tit tra trb trc tre trf tri trr trt tta ttb ttc tte ttf tti ttr ttt