-er -ic a-a a-b a-c a-i a-t aaa aab aac aae aai aao aar aat ab- aba abb abc abe abi abo abr abt ac- aca acb acc ace aci aco acr act aea aeb aec aee aei aeo aer aet ai- aia aib aic aie aii aio air ait aoa aob aoc aoe aoi aoo aor aot ar- ara arb arc are ari aro arr art at- ata atb atc ate ati ato atr att baa bab bac bae bai bao bar bat bba bbb bbc bbe bbi bbo bbr bbt bca bcb bcc bce bci bco bcr bct be- bea beb bec bee bei beo ber bet bi- bia bib bic bie bii bio bir bit boa bob boc boe boi boo bor bot bra brb bre bri bro brr brt bta btb btc bte bti bto btr btt c-- caa cab cac cae cai cao car cat cba cbb cbc cbe cbi cbo cbr cbt cca ccb ccc cce cci cco ccr cct ce- cea ceb cec cee cei ceo cer cet ci- cia cib cic cie cii cio cir cit co- coa cob coc coe coi coo cor cot cra crb crc cre cri cro crr crt cta ctb ctc cte cti cto ctr ctt eaa eab eac eae eai eao ear eat eba ebb ebc ebe ebi ebo ebr ebt ec- eca ecb ecc ece eci eco ecr ect eea eeb eec eee eeo eer eet eia eib eic eie eii eio eir eit eo- eoa eob eoc eoe eoi eoo eor eot era erb erc ere eri ero err ert eta etb etc ete eti eto etr ett ia- iaa iab iac iae iai iao iar iat iba ibb ibc ibe ibi ibo ibr ibt ica icb icc ice ici ico icr ict ie- iea iec iee iei ier iet iia iib iic iie iii iio iir iit io- ioa iob ioc ioe ioi ioo ior iot ir- ira irb irc ire iri iro irr irt ita itb itc ite iti ito itt o-i oaa oab oac oae oai oao oar oat ob- oba obb obc obe obi obo obr obt oc- oca ocb occ oci oco ocr oct oea oeb oec oee oei oeo oer oet oia oib oic oie oii oio oir oit oo- ooa oob ooc ooi ooo oor oot or- ora orb orc ore ori oro orr ort ot- ota otb otc ote oti oto otr ott ra- raa rab rac rae rai rao rar rat rba rbb rbc rbe rbi rbo rbr rbt rca rcb rcc rce rci rco rcr rct re- rea reb rec ree rei reo rer ret ria rib ric rie rii rio rir rit roa rob roc roe roi roo ror rot rra rrb rrc rri rrr rrt rta rtb rtc rte rti rto rtr rtt taa tab tac tae tai tao tar tat tba tbb tbc tbe tbi tbo tbr tbt tca tcb tcc tce tci tco tcr tct te- tea teb tec tee tei teo ter tet tia tib tic tie tii tio tir tit to- toa tob toc toe toi too tor tot tra trb trc tre tri tro trr trt tta ttb ttc tte tti tto ttr ttt