Exhibit 24.2

                                POWER OF ATTORNEY

        The undersigned individual (the "Reporting Person") hereby authorizes
and designates each entity affiliated with AH Capital Management, L.L.C., or
such other person or entity as is designated in writing by Ben Horowitz (the
"Designated Filer") as the beneficial owner to prepare and file on behalf of the
Reporting Person individually, or jointly together with other reporting persons,
any and all reports, notices, communications and other documents (including, but
not limited to, reports on Schedule 13D, Schedule 13G, Form 13-F, Form 3, Form
4 and Form 5) that the Reporting Person may be required to file with the United
States Securities and Exchange Commission pursuant to the Securities Act of
1933, as amended (together with the implementing regulations thereto, the "Act")
and the Securities Exchange Act of 1934, as amended (together with the
implementing regulations thereto, the "Exchange Act") (collectively, the
"Reports") with respect to the Reporting Person's ownership of, or transactions
in, securities of any entity whose securities are beneficially owned (directly
or indirectly) by the Reporting Person (collectively, the "Companies").

        The Reporting Person hereby further authorizes and designates Phil
Hathaway (the "Authorized Signatory") to execute and file on behalf of the
Reporting Person the Reports and to perform any and all other acts, which in the
opinion of the Designated Filer or Authorized Signatory may be necessary or
incidental to the performance of the foregoing powers herein granted.

        The authority of the Designated Filer and the Authorized Signatory under
this Document with respect to the Reporting Person shall continue until the
Reporting Person is no longer required to file any Reports with respect to the
Reporting Person's ownership of, or transactions in, the securities of the
Companies, unless earlier revoked in writing. The Reporting Person acknowledges
that the Designated Filer and the Authorized Signatory are not assuming any of
the Reporting Person's responsibilities to comply with the Act or the Exchange
Act.

June 22, 2023                                 By: /s/ Benjamin Horowitz
                                                  ---------------------
                                                  Benjamin Horowitz