NONFEASIBLE

ab ae ai al an as ba be bi bo ef el en es fa fe if in is la li lo na ne no oe of oi on os si so

abo abs ail ain ais alb ale als ane ani bal ban bas bee bel ben bes bin bio bis boa bos eel efs elf els ens eon fab fan fas fee fen fes fib fie fil fin fob foe fon ifs inn ins ion lab las lea lee lei les lib lie lin lis lob nab nae nan neb nee nib nil nob nos oaf oba obe obi oes oil ole one ons ose sab sae sal sea see sei sel sen sib sin sob sol son

able abos aeon ails ains albs alee alef ales alif aloe also anes anil anis anon bail bale bals bane bani bans base bean beef been bees bels bene bens bias bile bine bins bios bise blae blin boas boil bola bole bone ease ebon eels elan else enol eons esne fabs fail fain fane fano fans feal feeb feel fees fens fibs fila file filo fils fine fino fins flab flan flea flee floe foal fobs foes foil foin fons ilea info inns ions isba isle labs lain lane lase leaf lean leas lees leis leno lens libs lief lien lies life line linn lino lins lion loaf loan lobe lobs loin lone lose nabe nabs naif nail nans naoi naos nebs neif nene neon nibs nils nine nobs noel noes noil nona none nose oafs obas obes obia obis oils olea oles ones sabe safe sail sain sale sane seal seel seen seif self sene sial silo sine slab slob sloe snib snob soba sofa soil sola sole soli sone