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                                   [SPECIMEN]

                                                                    EXHIBIT 4(f)

             [AMBAC FINANCIAL GUARANTY INSURANCE POLICY LETTERHEAD]


Obligor:                                                         Policy Number:


Obligations:                                                     Premium:



AMBAC ASSURANCE CORPORATION (AMBAC) A Wisconsin Stock Insurance Company in
consideration of the payment of the premium and subject to the terms of 
this Policy, hereby agrees to pay to United States Trust Company of New
York, as trustee, or its successor (the "Insurance Trustee"), for the 
benefit of the Obligees, that portion of the principal of and interest on
the above-described obligations (the "Obligations") which shall become 
Due for Payment but shall be unpaid by reason of Nonpayment by the Obligor.

Ambac will make such payments to the Insurance Trustee within one (1)
business day following notification to Ambac of Nonpayment.  Upon an
Obligee's presentation and surrender to the Insurance Trustee of such 
unpaid Obligations or appurtenant coupons, uncanceled and in bearer form
and free of any adverse claim, the Insurance Trustee will disburse to the
Obligee the face amount of principal and interest which is then Due for
Payment but is unpaid.  Upon such disbursement, Ambac shall become the
owner of the surrendered Obligations and coupons and shall be fully subrogated
to all of the Obligee's rights to payment.

In cases where the Obligations are issuable only in a form whereby principal
is payable to registered Obligees or their assigns, the Insurance Trustee
shall disburse principal to an Obligee as aforesaid only upon presentation
and surrender to the Insurance Trustee of the unpaid Obligation, uncanceled
and free of any adverse claim, together with an instrument of assignment, in
form satisfactory to the Insurance Trustee duly executed by the Obligee or
such Obligee's duly authorized representative, so as to permit ownership of
such Obligation to be registered in the name of Ambac or its nominee.  In
cases where the Obligations are issuable only in a form whereby interest is
payable to registered Obligees or their assigns the Insurance Trustee shall
disburse interest to an Obligee as aforesaid only upon presentation to the 
Insurance Trustee of proof that the claimant is the person entitled to the 
payment of interest on the Obligation and delivery to the Insurance Trustee
of an instrument of assignment, in form satisfactory to the Insurance
Trustee, duly executed by the claimant Obligee or such Obligee's duly
authorized representative, transferring to Ambac all rights under such
Obligation to receive the interest in respect of which the insurance
disbursement was made.  Ambac shall be subrogated to all of the Obligees'
rights to payment on registered Obligations to the extent of the insurance
disbursements so made.

In the event that a trustee or paying agent for the Obligations has notice
that any payment of principal of or interest on an Obligation which has become
Due for Payment and which is made to an Obligee by or on behalf of the Obligor
has been deemed a preferential transfer and theretofore recovered from the
Obligee pursuant to the United States Bankruptcy Code in accordance with a 
final, nonappealable order of a court of competent jurisdiction, such 
Obligee will be entitled to payment from Ambac to the extent of such
recovery if sufficient funds are not otherwise available.

As used herein, the term "Obligee" means any person other than the Obligor who,
at the time of Nonpayment, is the owner of an Obligation or of a coupon 
appertaining to an Obligation.  As used herein, "Due for Payment", when 
referring to the principal of Obligations, is when the stated maturity date
or mandatory redemption date for the application of a required sinking fund
installment has been reached and does not refer to any earlier date on which 
payment is due by reason of call for redemption (other than by application of
required sinking fund installments), acceleration or other advancement of
maturity; and, when referring to interest on the Obligations, is when the stated
date for payment of interest has been reached.  As used herein, "Nonpayment" 
means the failure of the Obligor to have provided sufficient funds to the paying
agent for payment in full of all principal of and interest on the Obligations
which are Due for Payment.

This Policy is noncancelable.  The premium on this Policy is not refundable for
any reason, including payment of the Obligations prior to maturity.  This Policy
does not insure against loss of any prepayment or other acceleration payment 
which at any time may become due in respect of any Obligation, other than at the
sole option of Ambac, nor against any risk other than Nonpayment.

In witness whereof, Ambac has caused this Policy to be affixed with a facsimile
of its corporate seal and to be signed by its duly authorized officers in
facsimile to become effective as its original seal and signatures and binding 
upon Ambac by virtue of the countersignature of its duly authorized 
representative.

P. Lassiter                        [SEAL]              Stephen D. Cooke

President                                              Secretary

Effective Date:                                        Authorized Representative

UNITED STATES TRUST COMPANY OF NEW YORK acknowledges   H. William Weber
that it has agreed to perform the duties of Insurance  Authorized Officer
Trustee under this Policy.

Form No.: 2B-0012 (7/97)