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"Prefix: in-, im-, il-, ir- (not)"

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Words
-able / - ible
-er / -or
ex- e- ef-
form
illusory
immense
immobile
in-, im-, il-, ir-
inaccurate
indecipherable
inept
insane
insignificant
irrational
irrelevant
port
re-
struct/ stru
un-