-er a-a a-b a-i a-t aaa aab aae aaf aai aao aap aar aat ab- aba abb abe abf abi abo abp abr abt aea aeb aee aef aei aeo aep aer aet af- afa afb afe aff afi afo afp afr aft ai- aia aib aie aif aii aio aip air ait aoa aob aoe aof aoi aoo aop aor aot ap- apa apb ape apf api apo app apr apt ar- ara arb are arf ari aro arp arr art at- ata atb ate atf ati ato atp atr att b-p baa bab bae baf bai bao bap bar bat bba bbb bbe bbf bbi bbo bbp bbr bbt be- bea beb bee bef bei beo bep ber bet bfa bfb bfe bff bfi bfo bfp bfr bft bi- bia bib bie bif bii bio bip bir bit boa bob boe bof boi boo bop bor bot bpa bpb bpe bpf bpi bpo bpp bpr bpt bra brb bre brf bri bro brp brr brt bta btb bte btf bti bto btp btr btt eaa eab eae eaf eai eao eap ear eat eba ebb ebe ebf ebi ebo ebp ebr ebt eea eeb eee eef eeo eep eer eet ef- efa efb efe eff efi efo efp efr eft eia eib eie eif eii eio eip eir eit eo- eoa eob eoe eof eoi eoo eop eor eot ep- epa epb epe epf epi epo epp epr ept era erb ere erf eri ero erp err ert eta etb ete etf eti eto etp etr ett faa fab fae faf fai fao fap far fat fba fbb fbe fbf fbi fbo fbp fbr fbt fea feb fee fef fei feo fep fer fet ffa ffe fff ffi ffo ffp ffr fft fia fib fie fif fii fip fir fit foa fob foe fof foi foo fop for fot fpa fpb fpe fpi fpo fpp fpr fpt fra frb fre frf fri fro frp frr frt fta ftb fte ftf fti fto ftp ftr ftt i-f ia- iaa iab iae iaf iai iao iap iar iat iba ibb ibe ibf ibi ibo ibp ibr ibt ie- iea iee ief iei iep ier iet ifa ifb ife iff ifi ifo ifp ifr ift iia iib iie iif iii iio iip iir iit io- ioa iob ioe iof ioi ioo iop ior iot ipa ipb ipe ipf ipi ipo ipp ipr ipt ir- ira irb ire irf iri iro irp irr irt ita itb ite itf iti ito itp itt o-i oaa oab oae oaf oai oao oap oar oat ob- oba obb obe obf obi obo obp obr obt oea oeb oee oef oei oeo oep oer oet of- ofa ofb ofe off ofi ofo ofp ofr oft oia oib oie oif oii oio oip oir oit oo- ooa oob oof ooi ooo oop oor oot op- opa opb ope opf opi opo opp opr opt or- ora orb ore orf ori oro orp orr ort ot- ota otb ote otf oti oto otp otr ott p-p paa pab pae paf pai pao pap par pat pba pbb pbe pbf pbi pbo pbp pbr pbt pea peb pee pef pei peo pep per pet pfa pfb pfe pff pfi pfo pfp pfr pft pia pib pie pif pii pio pip pir pit poa pob poe pof poi poo pop por pot ppa ppb ppe ppf ppi ppo ppp ppr ppt pra prb pre prf pri pro prp prr prt pt- pta ptb pte ptf pti pto ptp ptr ptt ra- raa rab rae raf rai rao rap rar rat rba rbb rbe rbf rbi rbo rbp rbr rbt re- rea reb ree ref rei reo rep rer ret rfa rfb rfe rff rfi rfo rfp rfr rft ria rib rie rif rii rio rip rir rit roa rob roe rof roi roo rop ror rot rpa rpb rpe rpf rpi rpo rpp rpr rpt rra rrb rrf rri rrp rrr rrt rta rtb rte rtf rti rto rtp rtr rtt taa tab tae taf tai tao tap tar tat tba tbb tbe tbf tbi tbo tbp tbr tbt te- tea teb tee tef tei teo tep ter tet tfa tfb tfe tff tfi tfo tfp tfr tft tia tib tie tif tii tio tip tir tit to- toa tob toe tof toi too top tor tot tpa tpb tpe tpf tpi tpo tpp tpr tpt tra trb tre trf tri tro trp trr trt tta ttb tte ttf tti tto ttp ttr ttt