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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 html_for_env_var(key):
 """Returns an HTML snippet for an environment variable. Args: key: A string representing an environment variable name. Returns: String HTML representing the value and variable. """

    value = os.getenv(key)
    return KEY_VALUE_TEMPLATE.format(key, value)