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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 events_for_secretreveal( transfers_pair: List[MediationPairState], secret: Secret, pseudo_random_generator: random.Random, ) -> List[Event]: """ Reveal the secret off-chain. The secret is revealed off-chain even if there is a pending transaction to reveal it on-chain, this allows the unlock to happen off-chain, which is faster. This node is named N, suppose there is a mediated transfer with two refund transfers, one from B and one from C: Under normal operation N will first learn the secret from D, then reveal to C, wait for C to inform the secret is known before revealing it to B, and again wait for B before revealing the secret to A. If B somehow sent a reveal secret before C and D, then the secret will be revealed to A, but not C and D, meaning the secret won't be propagated forward. Even if D sent a reveal secret at about the same time, the secret will only be revealed to B upon confirmation from C. If the proof doesn't arrive in time and the lock's expiration is at risk, N won't lose tokens since it knows the secret can go on-chain at any time. """

    events: List[Event] = list()
    for pair in reversed(transfers_pair):
        payee_knows_secret = pair.payee_state in STATE_SECRET_KNOWN
        payer_knows_secret = pair.payer_state in STATE_SECRET_KNOWN
        is_transfer_pending = pair.payer_state == 'payer_pending'

        should_send_secret = (
            payee_knows_secret and
            not payer_knows_secret and
            is_transfer_pending
        )

        if should_send_secret:
            message_identifier = message_identifier_from_prng(pseudo_random_generator)
            pair.payer_state = 'payer_secret_revealed'
            payer_transfer = pair.payer_transfer
            revealsecret = SendSecretReveal(
                recipient=payer_transfer.balance_proof.sender,
                channel_identifier=CHANNEL_IDENTIFIER_GLOBAL_QUEUE,
                message_identifier=message_identifier,
                secret=secret,
            )

            events.append(revealsecret)

    return events