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4 . Construct proofs for the following, by using the rules of inference ONLY ( = Unit 7 ) [ 1 mark each ] a
Construct proofs for the following, by using the rules of inference
ONLY Unit mark each
a~ A ~ B ~ C E ~ A FE ~ F ~ C ~ F
b~ C ~ D A C E B ~ D F B EF ~ E A
cS PQ ~ R W Q T W A R W S TP ~ T
~ A
dS ~ TW X T X~ X S W
eA BC D C E D ~ FA ~ E ~ F ~ G
fA ~ B~ C DE AF ~ DE GF H
A T C E ~ H ~ T
Which of the following are substitution instances of p q ~ r
Unit Pay attention to the structure the operations, and their
positions mark
aA ~ B ~ C
b~ A ~ B C
c~ A B C ~ D
dA ~ A ~ A
eA BA C ~ D
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