-er -ic a-a a-b a-c a-i aaa aab aac aad aae aai aar aau ab- aba abb abc abd abe abi abr abu ac- aca acb acc acd ace aci acr acu ad- ada adb adc add ade adi adr adu aea aeb aec aed aee aei aer aeu ai- aia aib aic aid aie aii air aiu ar- ara arb arc ard are ari arr aru au- aua aub auc aud aue aui aur b-u baa bab bac bad bae bai bar bau bba bbb bbc bbd bbe bbi bbr bbu bca bcb bcc bcd bce bci bcr bcu bda bdb bdc bdd bde bdi bdr bdu be- bea beb bec bed bee bei ber beu bi- bia bib bic bid bie bii bir biu bra brb brd bre bri brr bru bua bub buc bud bue bui bur buu c-- caa cab cac cad cae cai car cau cba cbb cbc cbd cbe cbi cbr cbu cca ccb ccc ccd cce cci ccr ccu cda cdb cdc cdd cde cdi cdr cdu ce- cea ceb cec ced cee cei cer ceu ci- cia cib cic cid cie cii cir ciu cra crb crc crd cre cri crr cru cua cub cuc cud cue cui cur cuu daa dab dac dad dae dai dar dau dba dbb dbc dbd dbe dbi dbr dbu dca dcb dcc dcd dce dci dcr dcu dda ddb ddc ddd dde ddi ddr ddu de- dea deb dec ded dee dei der deu di- dia dib dic did die dii dir diu dra drb drc drd dre dri drr dru dua dub duc dud due dui dur eaa eab eac ead eae eai ear eau eba ebb ebc ebd ebe ebi ebr ebu ec- eca ecb ecc ecd ece eci ecr ecu ed- eda edb edc edd ede edi edr edu eea eeb eec eed eee eer eia eib eic eid eie eii eir eiu era erb erc erd ere eri err eru eu- eua eub euc eud eue eui eur i-d ia- iaa iab iac iad iae iai iar iau iba ibb ibc ibd ibe ibi ibr ibu ica icb icc icd ice ici icr icu ida idb idc idd ide idi idr idu ie- iea iec ied iee iei ier iia iib iic iid iie iii iir iiu ir- ira irb irc ird ire iri irr iru iu- iua iub iuc iud iue iui iur ra- raa rab rac rad rae rai rar rau rba rbb rbc rbd rbe rbi rbr rbu rca rcb rcc rcd rce rci rcr rcu rda rdb rdc rdd rde rdi rdr rdu re- rea reb rec red ree rei rer reu ria rib ric rid rie rii rir rra rrb rrc rrd rri rrr rru rua rub ruc rud rue rui rur ruu ua- uaa uab uac uad uae uai uar uau uba ubb ubc ube ubi ubr ubu uca ucb ucc ucd uce uci ucr ucu uda udb udc udd ude udi udr udu uea ueb uec ued uee uei uer uia uib uic uid uie uii uir uiu ur- ura urb urc urd ure uri urr uru uua uuc uue uur uuu