-er -ic a-a a-b a-c a-i a-t aaa aab aac aae aai aao aar aat aau ab- aba abb abc abe abi abo abr abt abu ac- aca acb acc ace aci aco acr act acu aea aeb aec aee aei aeo aer aet aeu ai- aia aib aic aie aii aio air ait aiu aoa aob aoc aoe aoi aoo aor aot aou ar- ara arb arc are ari aro arr art aru at- ata atb atc ate ati ato atr att atu au- aua aub auc aue aui auo aur aut b-u baa bab bac bae bai bao bar bat bau bba bbb bbc bbe bbi bbo bbr bbt bbu bca bcb bcc bce bci bco bcr bct bcu be- bea beb bec bee bei beo ber bet beu bi- bia bib bic bie bii bio bir bit biu boa bob boc boe boi boo bor bot bou bra brb bre bri bro brr brt bru bta btb btc bte bti bto btr btt btu bua bub buc bue bui buo bur but buu c-- caa cab cac cae cai cao car cat cau cba cbb cbc cbe cbi cbo cbr cbt cbu cca ccb ccc cce cci cco ccr cct ccu ce- cea ceb cec cee cei ceo cer cet ceu ci- cia cib cic cie cii cio cir cit ciu co- coa cob coc coe coi coo cor cot cou cra crb crc cre cri cro crr crt cru cta ctb ctc cte cti cto ctr ctt ctu cua cub cuc cue cui cuo cur cut cuu eaa eab eac eae eai eao ear eat eau eba ebb ebc ebe ebi ebo ebr ebt ebu ec- eca ecb ecc ece eci eco ecr ect ecu eea eeb eec eee eeo eer eet eia eib eic eie eii eio eir eit eiu eo- eoa eob eoc eoe eoi eoo eor eot eou era erb erc ere eri ero err ert eru eta etb etc ete eti eto etr ett etu eu- eua eub euc eue eui eur eut ia- iaa iab iac iae iai iao iar iat iau iba ibb ibc ibe ibi ibo ibr ibt ibu ica icb icc ice ici ico icr ict icu ie- iea iec iee iei ier iet iia iib iic iie iii iio iir iit iiu io- ioa iob ioc ioe ioi ioo ior iot iou ir- ira irb irc ire iri iro irr irt iru ita itb itc ite iti ito itt itu iu- iua iub iuc iue iui iur iut o-i oaa oab oac oae oai oao oar oat oau ob- oba obb obc obe obi obo obr obt obu oc- oca ocb occ oci oco ocr oct ocu oea oeb oec oee oei oeo oer oet oia oib oic oie oii oio oir oit oiu oo- ooa oob ooc ooi ooo oor oot or- ora orb orc ore ori oro orr ort oru ot- ota otb otc ote oti oto otr ott otu ou- oua ouc oue oui ouo our out ra- raa rab rac rae rai rao rar rat rau rba rbb rbc rbe rbi rbo rbr rbt rbu rca rcb rcc rce rci rco rcr rct rcu re- rea reb rec ree rei reo rer ret reu ria rib ric rie rii rio rir rit roa rob roc roe roi roo ror rot rou rra rrb rrc rri rrr rrt rru rta rtb rtc rte rti rto rtr rtt rtu rua rub ruc rue rui ruo rur rut ruu taa tab tac tae tai tao tar tat tau tba tbb tbc tbe tbi tbo tbr tbt tbu tca tcb tcc tce tci tco tcr tct tcu te- tea teb tec tee tei teo ter tet teu tia tib tic tie tii tio tir tit tiu to- toa tob toc toe toi too tor tot tou tra trb trc tre tri tro trr trt tru tta ttb ttc tte tti tto ttr ttt ttu tua tub tuc tue tui tuo tur tut tuu ua- uaa uab uac uae uai uao uar uat uau uba ubb ubc ube ubi ubo ubr ubt ubu uca ucb ucc uce uci uco ucr uct ucu uea ueb uec uee uei uer uet uia uib uic uie uii uio uir uit uiu uoa uob uoc uoe uoo uor uot ur- ura urb urc ure uri uro urr urt uru uta utb utc ute uti uto utr utt utu uua uuc uue uur uut uuu