NONREVERSIBLY

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

bee bel ben bes bey bin bio bis bos boy bro brr bye bys eel els ens eon ere ern err ers eve eye inn ins ion ire ivy lee lei les lev ley lib lie lin lis lob lye 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 rye see sei sel sen ser sib sin sir sly sob sol son soy sri syn vee vie vis voe yen yes yin yob yon

been beer bees bels bene bens bevy beys bier bile bine bins bios birl biro birr bise blin boil bole bone bony bore born boys bree bren brie brin brio bris bros byes byre byrl ebon eels eely eery else enol envy eons erne erns eros errs esne even ever eves evil eyen eyer eyes eyne eyre inby inly inns inro ions ires iron isle leer lees leis leno lens levo levy leys libs lien lier lies line linn lino lins liny lion lire live lobe lobs loin lone lore lorn lory lose love lyes lyre lyse nebs nene neon neve nevi nibs nils nine nobs noel noes noil noir none nori nose nosy obes obey obis oils oily oles ones only orbs orby ores orle oven over oyer oyes rebs reel rees rein reis rely revs ribs riel rile rins rise rive robe robs roes roil role rose rosy rove ryes seel seen seer sene sere silo sine sire slob sloe snib snob snye soil sole soli sone sorb sore sori sorn sybo syli syne veer vees veil vein verb very vibe vier vies vile vine vino viny viol virl vise voes vole yens yins yirr yobs yoni yore