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derive the conclusions of each of the following arguments using the rules of inference from section 3.1 (MP, MT, DS, HS).
-1. (P ?R) ? (P ? Q)
2. P ?R
3. P
4. Q ? ?S / ?S
Cheque
A written, dated, and signed instrument that directs a bank to pay a specific sum of money to the bearer or to a specified person.
Invoice
A document issued by a seller to a buyer, detailing products or services provided, quantities, and agreed prices.
Outstanding Balance
The amount of money owed that has not yet been repaid.
Invoice
A document detailing a transaction between a buyer and seller, including the quantity, price, and terms of sale.
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