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def findWordinLibraryBinarySearch(usrInput):
    usrInput = usrInput.lower()
    if any(char.isdigit() for char in usrInput):
        raise Exception('no numbers allowed')

    library = libraryBuilder()
    words = charPermutations(usrInput)

    foundWords = {}
    xtime = time.time()
    for word in words:
        first = int(0)  # Making sure its integers.
        last = int(len(library))  # Making sure its integers.
        found = False
        while first <= last and not found:
            midpoint = (first + last) / 2
            if library[midpoint] == word:
                found = True
            else:
                if word < library[midpoint]:
                    last = midpoint - 1
                else:
                    first = midpoint + 1
        if found:
            foundWords[midpoint] = library[midpoint]
    xtime = time.time() - xtime
    foundWords['time'] = xtime
    return foundWords