in-
in, into, within, on, toward: also used as an intensifier in some words of Latin origin [inbreed, infer, induct, instigate]: it becomes il- before l; im- before b, m, or p; and ir- before r
no, not, without, non- [insignificant]: it becomes il- before l;im- before b, m, or p; and ir- before r
See in- in American Heritage Dictionary 4
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