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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def start_record():
 """ Install an httplib wrapper that records but does not modify calls. """

    global record, playback, current
    if record:
        raise StateError("Already recording.")
    if playback:
        raise StateError("Currently playing back.")
    record = True
    current = ReplayData()
    install(RecordingHTTPConnection, RecordingHTTPSConnection)