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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 inject_into_urllib3():
    'Monkey-patch urllib3 with PyOpenSSL-backed SSL-support.'

    _validate_dependencies_met()

    util.ssl_.SSLContext = PyOpenSSLContext
    util.HAS_SNI = HAS_SNI
    util.ssl_.HAS_SNI = HAS_SNI
    util.IS_PYOPENSSL = True
    util.ssl_.IS_PYOPENSSL = True