def _combinations(instrumentString):
    """
    find all combinations of instrumentString.  Remove all punctuation.
    """
    sampleList = instrumentString.split()
    allComb = []
    for size in range(1, len(sampleList) + 1):
        for i in range(len(sampleList) - size + 1):
            allComb.append(' '.join(sampleList[i:i + size]))
    return allComb
