Negative forms and prefixes

- skip
- learn
illegal
imbalance
immoral
impatient
impolite
impossible
impractical
improper
inability
inactive
inadequate
inappropriate
inconvenient
incorrect
incurable
indecisive
indirect
ineffective
inefficient
inexpensive
informal
infrequent
inhumane
insecurity
insincere
insufficient
invalid
invisible
irregular
irrelevant
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