-er -ic a-a a-b a-c a-i a-t aaa aab aac aae aai aao aap aar aat ab- aba abb abc abe abi abo abp abr abt ac- aca acb acc ace aci aco acp acr act aea aeb aec aee aei aeo aep aer aet ai- aia aib aic aie aii aio aip air ait aoa aob aoc aoe aoi aoo aop aor aot ap- apa apb apc ape api apo app apr apt ar- ara arb arc are ari aro arp arr art at- ata atb atc ate ati ato atp atr att b-p baa bab bac bae bai bao bap bar bat bba bbb bbc bbe bbi bbo bbp bbr bbt bca bcb bcc bce bci bco bcp bcr bct be- bea beb bec bee bei beo bep ber bet bi- bia bib bic bie bii bio bip bir bit boa bob boc boe boi boo bop bor bot bpa bpb bpc bpe bpi bpo bpp bpr bpt bra brb bre bri bro brp brr brt bta btb btc bte bti bto btp btr btt c-- caa cab cac cae cai cao cap car cat cba cbb cbc cbe cbi cbo cbp cbr cbt cca ccb ccc cce cci cco ccp ccr cct ce- cea ceb cec cee cei ceo cep cer cet ci- cia cib cic cie cii cio cip cir cit co- coa cob coc coe coi coo cop cor cot cpa cpb cpc cpe cpi cpo cpp cpr cpt cra crb crc cre cri cro crp crr crt cta ctb ctc cte cti cto ctp ctr ctt eaa eab eac eae eai eao eap ear eat eba ebb ebc ebe ebi ebo ebp ebr ebt ec- eca ecb ecc ece eci eco ecr ect eea eeb eec eee eeo eep eer eet eia eib eic eie eii eio eip eir eit eo- eoa eob eoc eoe eoi eoo eop eor eot ep- epa epb epc epe epi epo epp epr ept era erb erc ere eri ero erp err ert eta etb etc ete eti eto etp etr ett ia- iaa iab iac iae iai iao iap iar iat iba ibb ibc ibe ibi ibo ibp ibr ibt ica icb icc ice ici ico icp icr ict ie- iea iec iee iei iep ier iet iia iib iic iie iii iio iip iir iit io- ioa iob ioc ioe ioi ioo iop ior iot ipa ipb ipc ipe ipi ipo ipp ipr ipt ir- ira irb irc ire iri iro irp irr irt ita itb itc ite iti ito itp itt o-i oaa oab oac oae oai oao oap oar oat ob- oba obb obc obe obi obo obp obr obt oc- oca ocb occ oci oco ocp ocr oct oea oeb oec oee oei oeo oep oer oet oia oib oic oie oii oio oip oir oit oo- ooa oob ooc ooi ooo oop oor oot op- opa opb opc ope opi opo opp opr opt or- ora orb orc ore ori oro orp orr ort ot- ota otb otc ote oti oto otp otr ott p-p paa pab pac pae pai pao pap par pat pba pbb pbc pbe pbi pbo pbp pbr pbt pca pcb pcc pce pci pco pcp pcr pct pea peb pec pee pei peo pep per pet pia pib pic pie pii pio pip pir pit poa pob poc poe poi poo pop por pot ppa ppb ppc ppe ppi ppo ppp ppr ppt pra prb prc pre pri pro prp prr prt pt- pta ptb ptc pte pti pto ptp ptr ptt ra- raa rab rac rae rai rao rap rar rat rba rbb rbc rbe rbi rbo rbp rbr rbt rca rcb rcc rce rci rco rcp rcr rct re- rea reb rec ree rei reo rep rer ret ria rib ric rie rii rio rip rir rit roa rob roc roe roi roo rop ror rot rpa rpb rpc rpe rpi rpo rpp rpr rpt rra rrb rrc rri rrp rrr rrt rta rtb rtc rte rti rto rtp rtr rtt taa tab tac tae tai tao tap tar tat tba tbb tbc tbe tbi tbo tbp tbr tbt tca tcb tcc tce tci tco tcp tcr tct te- tea teb tec tee tei teo tep ter tet tia tib tic tie tii tio tip tir tit to- toa tob toc toe toi too top tor tot tpa tpb tpc tpe tpi tpo tpp tpr tpt tra trb trc tre tri tro trp trr trt tta ttb ttc tte tti tto ttp ttr ttt