c. Unused letters of credit of NT$321 million.  d. Contract to print billing, envelopes and marketing gifts of NT$57 million.  e. LED has already contracted to advance sale of lands and buildings for NT$2,593 million, and collected  NT$507 million in advance according to the contracts.  f. For the purpose of completing the construction, acquisition of the building construction license and  registration ownerships of all buildings for Wan-Xi Project and LightEra Covent Garden Project, LED  signed the trust deeds with Hua Nan Bank, China Real Estate Management Co., Ltd. and Land Bank for  the fund management, property rights and related development to the extent of authority they are given.  g. The Company also has non-cancelable operating leases covering certain buildings, computers, computer  peripheral equipment and operation system software under contracts that expire in various years. Future  lease payments are as follows:  h. A commitment to contribute NT$2,000 million to a Piping Fund administered by the Taipei City  Government, of which NT$1,000 million was contributed by Chunghwa on August 15, 1996 (classified as  long-term investment—other monetary assets). If the fund is not sufficient, Chunghwa will contribute the  remaining NT$1,000 million upon notification from the Taipei City Government. Based on Chunghwa’s  understanding of the Piping Fund terms, if the project is considered to be no longer necessary by the ROC  government, Chunghwa will receive back its proportionate share of the net equity of the Piping Fund upon  its dissolution. The Company does not know when its contribution to the Piping Fund will be returned;  therefore, the Company did not discount the face amount of its contribution to the Piping Fund.  F-53 Year Amount NT$ (In Millions) 2011 $  1,629  2012 1,292  2013 977  2014 748  2015 and thereafter 608  December 31,  2010 NT$ (In Millions) Restricted assets bank deposits $  169  Land held under development 1,085  $  1,254  Trust assets are as follow: 