bbb bbi bbn bbs bi- bib bii bin bis biv bnb bni bnn bns bnv bsb bsi bsn bss bsv bvb bvi bvn bvs bvv i-v ibb ibi ibn ibs ibv iib iii iin iis in- inb ini inn ins inv is- isb isi isn iss isv ivb ivi ivs ivv n-i nbb nbi nbn nbs nbv nib nii nin nis niv nnb nni nnn nns nnv nsb nsi nsn nss nsv nvb nvi nvn nvv sbb sbi sbn sbs sbv sib sii sin sis siv snb sni snn sns snv ss- ssb ssi ssn sss ssv svb svi svn svs svv vbi vbs vbv vi- vib vii vin vis viv vn- vni vns vnv vsb vsi vsn vss vsv vvb vvi vvs vvv