LetterSequenceProgram

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from random import randrange

def generateLetterSequence(n):
    """                                                                        
    Generates a random sequence of two subsequences ["A","B","C"] 
    or ["A","C","B"] of length n*3.
    """
    result = []
    for i in range(n):
        x = randrange(0,2)
        if x==0: result += ["A","B","C"]
        else: result += ["A","C","B"]
    return result

encoding = generateLetterSequence(100)
print encoding