-er -ic a-a a-b a-c a-i aaa aab aac aae aai aar aau ab- aba abb abc abe abi abr abu ac- aca acb acc ace aci acr acu aea aeb aec aee aei aer aeu ai- aia aib aic aie aii air aiu ar- ara arb arc are ari arr aru au- aua aub auc aue aui aur b-u baa bab bac bae bai bar bau bba bbb bbc bbe bbi bbr bbu bca bcb bcc bce bci bcr bcu be- bea beb bec bee bei ber beu bi- bia bib bic bie bii bir biu bra brb bre bri brr bru bua bub buc bue bui bur buu c-- caa cab cac cae cai car cau cba cbb cbc cbe cbi cbr cbu cca ccb ccc cce cci ccr ccu ce- cea ceb cec cee cei cer ceu ci- cia cib cic cie cii cir ciu cra crb crc cre cri crr cru cua cub cuc cue cui cur cuu eaa eab eac eae eai ear eau eba ebb ebc ebe ebi ebr ebu ec- eca ecb ecc ece eci ecr ecu eea eeb eec eee eer eia eib eic eie eii eir eiu era erb erc ere eri err eru eu- eua eub euc eue eui eur ia- iaa iab iac iae iai iar iau iba ibb ibc ibe ibi ibr ibu ica icb icc ice ici icr icu ie- iea iec iee iei ier iia iib iic iie iii iir iiu ir- ira irb irc ire iri irr iru iu- iua iub iuc iue iui iur ra- raa rab rac rae rai rar rau rba rbb rbc rbe rbi rbr rbu rca rcb rcc rce rci rcr rcu re- rea reb rec ree rei rer reu ria rib ric rie rii rir rra rrb rrc rri rrr rru rua rub ruc rue rui rur ruu ua- uaa uab uac uae uai uar uau uba ubb ubc ube ubi ubr ubu uca ucb ucc uce uci ucr ucu uea ueb uec uee uei uer uia uib uic uie uii uir uiu ur- ura urb urc ure uri urr uru uua uuc uue uur uuu