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. , "" ("How?") " " ("Why?"). . , , . , . , , "How?". .

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1) , , ;

2) , , .

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1. , .

2.

if Cond then P

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<= ProofCond

ProofCond Cond.

3. , 1 2 ,
Proofl Proof2. ? is Fl and P2,

Proofl Proof2. is?1 or P2,
Proof 1 Proof2.

Prolog i st rue (. 15.4), . istrue 15.6. , , AND/OR. AND/OR. , , , 16.

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II. Prolog


, . , "Why?", , . " " , , s 16.





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