system: You are a contract-analysis assistant performing a span-extraction task. You are given an excerpt from a commercial contract and the name of a clause type to locate within it.

Return the exact text of the requested clause, copied verbatim from the excerpt — identical wording and punctuation, with no paraphrasing, summarising, explanation, or added commentary.

The excerpt is one window of a much longer contract and often will not contain the requested clause. If the requested clause does not appear in this excerpt, respond with exactly: Not found.

Output only the extracted clause text, or the exact string `Not found.` — nothing else.

user: Contract excerpt:
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EXHIBIT 10.21 SPONSORSHIP AGREEMENT THIS AGREEMENT, dated for reference purposes as of July 12, 1999 (the "Agreement"), is by and between FOOTBALL NORTHWEST LLC, a Washington limited liability company ("FNW") and MERCATA, Inc., a Delaware corporation ("Sponsor"). R E C I T A L S --------------- A. Pursuant to that certain Consent to Assignment and Amendment of Use Agreement dated January 7, 1997, as amended, between King County, Washington ("King County") and FNW, FNW is granted the exclusive right to and revenue from all advertising both inside and outside the King County Domed Stadium (the "Kingdome") and the Kingdome Pavilion, including on adjacent parking lots. B. The Kingdome is located in Seattle, Washington and currently serves as the home venue for the National Football League ("NFL") franchise for the Seattle Seahawks. C. FNW owns and, during the term of this Agreement, FNW or its successor or assign will retain the exclusive signage and advertising rights for the Kingdome. D. Sponsor desires to acquire from FNW certain sponsorship rights in the areas described below and FNW is vested with the authority to grant and desires to grant such rights to Sponsor in accordance with the terms and provisions of this Agreement. NOW, THEREFORE, in consideration of the foregoing and for other good and valuable consideration, receipt of which is hereby acknowledged, the parties hereby agree as follows: 1. Sponsorship Benefits. Sponsor shall during the term of this Agreement -------------------- receive the following sponsorship benefits: A. Television 1. Three (3) :30 second Sponsor produced commercials ("Concept Ads") to air within each of three (3) preseason telecasts. 2. Three (3) :30 second Seahawks produced commercials ("Products Ads") to air within each of three (3) preseason telecasts. Content shall be reviewed and approved by Sponsor. Shawn Springs will be featured in the commercial. 3. Opening/closing billboards in each of three (3) Seahawks preseason games including Sponsor logo. 4. Sponsorship of one (1) feature ("Instant Replay") in three (3) preseason games including billboard and Sponsor logo visual. Total of three (3) features, billboards and logo identifications. 5. Three (3) Sponsor logo exposures in the Hawk Box Scoreboards per quarter during three (3) preseason games. 6. Sponsor a minimum of three (3) "live" power buy announcements ("Live Ads") during the course of three (3) telecasts. Announcement format to be determined. 7. Production: Seahawks will cover all hard costs to create, direct and produce one (1) :30 second TV spot to be used in three (3) preseason telecasts. Sponsor 1. will provide creative direction for the production and shall have the right to use such commercial where appropriate in its general advertising campaign or within certain promotional material during the 1999 season. 8. The sequence of TV appearance should always be: . FIRST appearance: Concept Ad (before last commercial series prior to a break) . SECOND appearance: Products Ad (last commercial series prior to a break) . THIRD appearance: Live Ad (during the break) One sequence per quarter from 1st to 3rd quarter. B. Kingdome Promotion/DiamondVision 1. Two (2) DiamondVision announcements per game for three (3) games. Total of six (6) DiamondVision announcements. Content will have to be reviewed and approved by Sponsor. 2. Sponsor opportunity to run :30 second television spot on DiamondVision during pregame warm-ups for three (3) preseason games. Total of three (3) spots 3. Sponsor (Promotional) road trip for two (2) including airfare, hotel and game tickets. Must participate in Sponsor/Seahawks Sweepstakes to be eligible for road trip. Designated road trip: Seattle @ Chicago on September 19, 1999. The value of this package is less $5,000 and shall be provided by FNW. C Seahawks.com 1. One (1) rotating banner ad on Seahawks.com for sixty (60) days (August through September 1999) Extension beyond the sixty (60) days to offered to Sponsor at favorable cpm based rate. 2. Seahawks to promote Sponsor online store from Seahawks.com's front page by providing a graphic and a text link directing visitors to Mercata.com. Text and graphics to be provided by Sponsor, and reviewed and approved by Seahawks.com. 3. Sponsor acknowledgement on Seahawks Television network web page on Seahawks.com 4. Sponsor will feature an online Seahawks-themed store selling Seahawks merchandising at Mercata.com. D. VIP Benefits 1. Two (2) season tickets with option to purchase two (2) playoff tickets 2. Twenty (20) tickets to two (2) preseason home games, August 14 and August 28, 1999. 3. One half-page color ad in Seahawks Insider for the 1999 season. Deadline for ad July 23, 1999. If Sponsor cannot meet the deadline, Seahawks
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Extract the exact clause related to "Document Name" from the excerpt above.

assistant: SPONSORSHIP AGREEMENT