Sorry, the term X3.64 is not in the dictionary. Check the spelling and try removing suffixes like "-ing" and "-s".
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Nearby terms:
X.229 ♦ X.25 ♦ X.28 ♦ X.29 ♦ X.3 ♦ X3J16 ♦ X3T10 ♦ X.400 ♦ X.409 ♦ X.500 ♦ X.680
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