NONREVERSIBLE

be bi bo el en er es in is li lo ne no oe oi on or os re si so

bee bel ben bes bin bio bis bos bro brr eel els ens eon ere ern err ers eve inn ins ion ire lee lei les lev lib lie lin lis lob neb nee nib nil nob nor nos obe obi oes oil ole one ons orb ore ors ose reb ree rei res rev rib rin rob roe see sei sel sen ser sib sin sir sob sol son sri vee vie vis voe

been beer bees bels bene bens bier bile bine bins bios birl biro birr bise blin boil bole bone bore born bree bren brie brin brio bris bros ebon eels else enol eons erne erns eros errs esne even ever eves evil inns inro ions ires iron isle leer lees leis leno lens levo libs lien lier lies line linn lino lins lion lire live lobe lobs loin lone lore lorn lose love nebs nene neon neve nevi nibs nils nine nobs noel noes noil noir none nori nose obes obis oils oles ones orbs ores orle oven over rebs reel rees rein reis revs ribs riel rile rins rise rive robe robs roes roil role rose rove seel seen seer sene sere silo sine sire slob sloe snib snob soil sole soli sone sorb sore sori sorn veer vees veil vein verb vibe vier vies vile vine vino viol virl vise voes vole