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Added a complete revision from Marco Maggesi of the "Ntrie" library
for manipulation of concrete numeral sets using a trie-like representation. Among other improvements, the conversions have been made cleaner (always failing predictably on non-minimal ntries) and much more efficient (typically 5x-15x as fast), and a syntax extension for ntries has been added. Moved a few existing things (theorems DIVIDES_ANTISYM, DIVIDES_LE_STRONG, DIVIDES_ONE and the definition of "prime") from "Library/prime.ml" into the core, to avoid loading all that file for a few more simple facts, and also added two new (and trivial) theorems ONE_OR_PRIME and FORALL_INT_CASES.
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