NONPOSSIBLE

be bi bo el en es in is li lo ne no oe oi on op os pe pi si so

bel ben bes bin bio bis boo bop bos els ens eon ess inn ins ion lei les lib lie lin lip lis lob loo lop neb nib nil nip nob noo nos obe obi oes oil ole one ono ons ope ops ose pen pes pie pin pis poi pol poo psi sei sel sen sib sin sip sis sob sol son sop sos

bels bens bile bine bins bios bise blin blip boil bole bolo bone boon boos bops boss ebon enol eons epos inns ions isle leis leno lens less libs lien lies line linn lino lins lion lipe lips lisp lobe lobo lobs loin lone loon loop loos lope lops lose loss nebs neon ness nibs nils nine nips nobs noel noes noil nolo none noon nope nose obes obis oboe obol oils oleo oles olio ones onos oops open opes oses pein pens peon peso pies pile pine pins pion piso piss pleb plie pois pole polo pols pone pons pool poon poos pose psis seis sels sibs silo sine sins sipe sips slip slob sloe slop snib snip snob sobs soil sole soli solo sols sone sons soon sops spin