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Condensed Balance Sheets (Parenthetical)	Mar. 31, 2012	Dec. 31, 2011
Condensed Balance Sheets [Abstract]
Beneficiaries' equity - authorized	1,500,000	1,500,000
Beneficiaries' equity - outstanding	1,500,000	1,500,000

Total number of shares of common stock held by shareholders. May be all or portion of the number of common shares authorized. These shares represent the ownership interest of the common shareholders. Shares outstanding equals shares issued minus shares held in treasury and other adjustments, if any.

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