a-a a-b a-i a-t aaa aab aai aao aas aat aav ab- aba abb abi abo abs abt abv ai- aia aib aii aio ais ait aiv aoa aob aoi aoo aos aot aov as- asa asb asi aso ass ast asv at- ata atb ati ato ats att atv av- ava avb avi avo avs avt baa bab bai bao bas bat bav bba bbb bbi bbo bbs bbt bi- bia bib bii bio bis bit biv boa bob boi boo bos bot bov bsa bsb bsi bso bss bst bsv bta btb bti bto bts btt btv bva bvb bvi bvo bvs bvt bvv i-v ia- iaa iab iai iao ias iat iav iba ibb ibi ibo ibs ibt ibv iia iib iii iio iis iit io- ioa iob ioi ioo ios iot iov is- isa isb isi iso iss ist isv ita itb iti ito its itt itv iva ivb ivi ivo ivs ivt ivv o-i oaa oab oai oao oas oat oav ob- oba obb obi obo obs obt obv oia oib oii oio ois oit oiv oo- ooa oob ooi ooo oos oot oov os- osa osb osi oso oss ost osv ot- ota otb oti oto ots ott otv ov- ova ovb ovi ovo ovs ovv saa sab sai sao sas sat sav sba sbb sbi sbo sbs sbt sbv sia sib sii sio sis sit siv soa sob soi soo sos sot sov ss- ssa ssb ssi sso sss sst ssv sta stb sti sto sts stt stv sva svb svi svo svs svt svv taa tab tai tao tas tat tav tba tbb tbi tbo tbs tbt tbv tia tib tii tio tis tit tiv to- toa tob toi too tos tot tov tsa tsb tsi tso tss tst tsv tta ttb tti tto tts ttt ttv tva tvb tvi tvo tvs tvt v-a vaa vab vai vao vas vat vav vba vbi vbo vbs vbv vi- via vib vii vio vis vit viv voa vob voi voo vos vot vov vsa vsb vsi vso vss vst vsv vta vtb vti vto vts vtt vtv vva vvb vvi vvo vvs vvt vvv