a-a a-b a-i aaa aab aai aar aas aav ab- aba abb abi abr abs abv ai- aia aib aii air ais aiv ar- ara arb ari arr ars arv as- asa asb asi asr ass asv av- ava avb avi avr avs baa bab bai bar bas bav bba bbb bbi bbr bbs bi- bia bib bii bir bis biv bra brb bri brr brs brv bsa bsb bsi bsr bss bsv bva bvb bvi bvr bvs bvv i-v ia- iaa iab iai iar ias iav iba ibb ibi ibr ibs ibv iia iib iii iir iis ir- ira irb iri irr irs irv is- isa isb isi isr iss isv iva ivb ivi ivr ivs ivv ra- raa rab rai rar ras rav rba rbb rbi rbr rbs ria rib rii rir ris riv rra rrb rri rrr rrs rsa rsb rsi rsr rss rsv rva rvb rvi rvr rvs rvv saa sab sai sar sas sav sba sbb sbi sbr sbs sbv sia sib sii sir sis siv sr- sra srb sri srr srs srv ss- ssa ssb ssi ssr sss ssv sva svb svi svr svs svv v-a vaa vab vai var vas vav vba vbi vbr vbs vbv vi- via vib vii vir vis viv vra vrb vri vrr vrs vsa vsb vsi vsr vss vsv vva vvb vvi vvr vvs vvv