-er a-a a-b a-i aaa aab aae aai aar aas aau ab- aba abb abe abi abr abs abu aea aeb aee aei aer aes aeu ai- aia aib aie aii air ais aiu ar- ara arb are ari arr ars aru as- asa asb ase asi asr ass asu au- aua aub aue aui aur aus b-u baa bab bae bai bar bas bau bba bbb bbe bbi bbr bbs bbu be- bea beb bee bei ber bes beu bi- bia bib bie bii bir bis biu bra brb bre bri brr brs bru bsa bsb bse bsi bsr bss bsu bua bub bue bui bur bus buu eaa eab eae eai ear eas eau eba ebb ebe ebi ebr ebs ebu eea eeb eee eer ees eia eib eie eii eir eis eiu era erb ere eri err ers eru es- esa esb ese esi esr ess esu eu- eua eub eue eui eur eus ia- iaa iab iae iai iar ias iau iba ibb ibe ibi ibr ibs ibu ie- iea iee iei ier ies iia iib iie iii iir iis iiu ir- ira irb ire iri irr irs iru is- isa isb ise isi isr iss isu iu- iua iub iue iui iur ius ra- raa rab rae rai rar ras rau rba rbb rbe rbi rbr rbs rbu re- rea reb ree rei rer res reu ria rib rie rii rir ris rra rrb rri rrr rrs rru rsa rsb rse rsi rsr rss rsu rua rub rue rui rur rus ruu saa sab sae sai sar sas sau sba sbb sbe sbi sbr sbs sbu se- sea seb see sei ser ses seu sia sib sie sii sir sis siu sr- sra srb sre sri srr srs ss- ssa ssb sse ssi ssr sss ssu sua sub sue sui sur sus suu ua- uaa uab uae uai uar uas uau uba ubb ube ubi ubr ubs ubu uea ueb uee uei uer ues uia uib uie uii uir uis uiu ur- ura urb ure uri urr urs uru usa usb use usi usr uss usu uua uue uur uus uuu