<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def secret_learned( state: MediatorTransferState, channelidentifiers_to_channels: ChannelMap, pseudo_random_generator: random.Random, block_number: BlockNumber, block_hash: BlockHash, secret: Secret, secrethash: SecretHash, payee_address: Address, ) -> TransitionResult[MediatorTransferState]: """ Unlock the payee lock, reveal the lock to the payer, and if necessary register the secret on-chain. """

    secret_reveal_events = set_offchain_secret(
        state,
        channelidentifiers_to_channels,
        secret,
        secrethash,
    )

    set_offchain_reveal_state(
        state.transfers_pair,
        payee_address,
    )

    onchain_secret_reveal = events_for_onchain_secretreveal_if_closed(
        channelmap=channelidentifiers_to_channels,
        transfers_pair=state.transfers_pair,
        secret=secret,
        secrethash=secrethash,
        block_hash=block_hash,
    )

    offchain_secret_reveal = events_for_secretreveal(
        state.transfers_pair,
        secret,
        pseudo_random_generator,
    )

    balance_proof = events_for_balanceproof(
        channelidentifiers_to_channels,
        state.transfers_pair,
        pseudo_random_generator,
        block_number,
        secret,
        secrethash,
    )

    events = secret_reveal_events + offchain_secret_reveal + balance_proof + onchain_secret_reveal
    iteration = TransitionResult(state, events)

    return iteration