-er -ic a-a a-b a-c a-i aaa aab aac aae aai aar aau aax ab- aba abb abc abe abi abr abu abx ac- aca acb acc ace aci acr acu acx aea aeb aec aee aei aer aeu aex ai- aia aib aic aie aii air aiu aix ar- ara arb arc are ari arr aru arx au- aua aub auc aue aui aur aux ax- axa axe axi axr axx b-u baa bab bac bae bai bar bau bax bba bbb bbc bbe bbi bbr bbu bbx bca bcb bcc bce bci bcr bcu bcx be- bea beb bec bee bei ber beu bex bi- bia bib bic bie bii bir biu bix bra brb bre bri brr bru brx bua bub buc bue bui bur buu bux bxb bxi bxx c-- caa cab cac cae cai car cau cax cba cbb cbc cbe cbi cbr cbu cbx cca ccb ccc cce cci ccr ccu ccx ce- cea ceb cec cee cei cer ceu cex ci- cia cib cic cie cii cir ciu cix cra crb crc cre cri crr cru crx cua cub cuc cue cui cur cuu cxc cxi cxr cxx eaa eab eac eae eai ear eau eax eba ebb ebc ebe ebi ebr ebu ebx ec- eca ecb ecc ece eci ecr ecu ecx eea eeb eec eee eer eex eia eib eic eie eii eir eiu eix era erb erc ere eri err eru eu- eua eub euc eue eui eur eux ex- exa exc exe exi exr exu exx ia- iaa iab iac iae iai iar iau iba ibb ibc ibe ibi ibr ibu ibx ica icb icc ice ici icr icu ie- iea iec iee iei ier iex iia iib iic iie iii iir iiu iix ir- ira irb irc ire iri irr iru irx iu- iua iub iuc iue iui iur ixc ixe ixi ra- raa rab rac rae rai rar rau rax rba rbb rbc rbe rbi rbr rbu rbx rca rcb rcc rce rci rcr rcu rcx re- rea reb rec ree rei rer reu rex ria rib ric rie rii rir rix rra rrb rrc rri rrr rru rua rub ruc rue rui rur ruu rux rxr ua- uaa uab uac uae uai uar uau uba ubb ubc ube ubi ubr ubu ubx 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 urx uua uuc uue uur uuu uxb uxc uxr uxu xaa xac xar xau xbc xbe xbr xbx xcb xci xcr xcx xee xer xeu xex xia xic xie xii xiu xix xrc xrx xue xui xxi xxx