POLYBUTENE

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bee bel ben bet bey bop bot boy bun but buy bye eel eon eye lee let leu ley lob lop lot lye neb nee net nob not nub nut obe ole one ope opt out pee pen pet ply pol pot pub pul pun put pye tee tel ten toe ton top toy tub tun tup tye upo ute yen yep yet yob yon you yup

been beep beet belt bene bent blet blot blue bole bolt bone bony bout bunt buoy bute byte ebon eely enol eyen eyne leet leno lent lept lobe lone lope loup lout lube lune lunt luny lute neep noel nope note obey only open peel peen pele pelt pent peon pleb plot ploy poet pole poly pone pony pout pule punt puny teel teen tele toby tole tolu tone tony tope tube tule tune tyee tyne type typo unbe unto upby upon yelp yule