-er -ic a-a a-b a-c a-i aaa aab aac aae aai aao aar aas aau ab- aba abb abc abe abi abo abr abs abu ac- aca acb acc ace aci aco acr acs acu aea aeb aec aee aei aeo aer aes aeu ai- aia aib aic aie aii aio air ais aiu aoa aob aoc aoe aoi aoo aor aos aou ar- ara arb arc are ari aro arr ars aru as- asa asb asc ase asi aso asr ass asu au- aua aub auc aue aui auo aur aus b-u baa bab bac bae bai bao bar bas bau bba bbb bbc bbe bbi bbo bbr bbs bbu bca bcb bcc bce bci bco bcr bcs bcu be- bea beb bec bee bei beo ber bes beu bi- bia bib bic bie bii bio bir bis biu boa bob boc boe boi boo bor bos bou bra brb bre bri bro brr brs bru bsa bsb bsc bse bsi bso bsr bss bsu bua bub buc bue bui buo bur bus buu c-- caa cab cac cae cai cao car cas cau cba cbb cbc cbe cbi cbo cbr cbs cbu cca ccb ccc cce cci cco ccr ccs ccu ce- cea ceb cec cee cei ceo cer ces ceu ci- cia cib cic cie cii cio cir cis ciu co- coa cob coc coe coi coo cor cos cou cra crb crc cre cri cro crr crs cru csa csb csc cse csi cso csr css csu cua cub cuc cue cui cuo cur cus cuu eaa eab eac eae eai eao ear eas eau eba ebb ebc ebe ebi ebo ebr ebs ebu ec- eca ecb ecc ece eci eco ecr ecs ecu eea eeb eec eee eeo eer ees eia eib eic eie eii eio eir eis eiu eo- eoa eob eoc eoe eoi eoo eor eos eou era erb erc ere eri ero err ers eru es- esa esb esc ese esi eso esr ess esu eu- eua eub euc eue eui eur eus ia- iaa iab iac iae iai iao iar ias iau iba ibb ibc ibe ibi ibo ibr ibs ibu ica icb icc ice ici ico icr ics icu ie- iea iec iee iei ier ies iia iib iic iie iii iio iir iis iiu io- ioa iob ioc ioe ioi ioo ior ios iou ir- ira irb irc ire iri iro irr irs iru is- isa isb isc ise isi iso isr iss isu iu- iua iub iuc iue iui iur ius o-i oaa oab oac oae oai oao oar oas oau ob- oba obb obc obe obi obo obr obs obu oc- oca ocb occ oci oco ocr ocs ocu oea oeb oec oee oei oeo oer oes oia oib oic oie oii oio oir ois oiu oo- ooa oob ooc ooi ooo oor oos or- ora orb orc ore ori oro orr ors oru os- osa osb osc ose osi oso osr oss osu ou- oua ouc oue oui ouo our ous ra- raa rab rac rae rai rao rar ras rau rba rbb rbc rbe rbi rbo rbr rbs rbu rca rcb rcc rce rci rco rcr rcs rcu re- rea reb rec ree rei reo rer res reu ria rib ric rie rii rio rir ris roa rob roc roe roi roo ror ros rou rra rrb rrc rri rrr rrs rru rsa rsb rsc rse rsi rso rsr rss rsu rua rub ruc rue rui ruo rur rus ruu saa sab sac sae sai sao sar sas sau sba sbb sbc sbe sbi sbo sbr sbs sbu sca scb scc sce sci sco scr scs scu se- sea seb sec see sei seo ser ses seu sia sib sic sie sii sio sir sis siu soa sob soc soe soi soo sor sos sou sr- sra srb src sre sri sro srr srs ss- ssa ssb ssc sse ssi sso ssr sss ssu sua sub suc sue sui suo sur sus suu ua- uaa uab uac uae uai uao uar uas uau uba ubb ubc ube ubi ubo ubr ubs ubu uca ucb ucc uce uci uco ucr ucs ucu uea ueb uec uee uei uer ues uia uib uic uie uii uio uir uis uiu uoa uob uoc uoe uoo uor uos ur- ura urb urc ure uri uro urr urs uru usa usb usc use usi uso usr uss usu uua uuc uue uur uus uuu