A clause requiring payments to be made 'without set-off or counterclaim' unambiguously excludes all forms of set-off, including equitable set-off, and prevents a guarantor from reducing the creditor's claim by amounts the borrower may have overpaid. A borrower's remedy for mistaken payments must be pursued in separate proceedings. The question whether a guarantor has an independent right to claim restitution of the borrower's overpayment from the creditor was left open.
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