Răspuns :
x a b c
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f₁ 1 1 1 construim functiile f₁ ,f₂,f₃ ,...
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f₂ 1 1 2
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f₃ 1 2 1 fals
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f₄ 1 2 2 fals
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f₅ 2 1 1 fals
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f₆ 2 2 1 fals
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f₇ 2 1 2 fals
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f₈ 2 2 2 fals
⇒ 2 functii
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f₁ 1 1 1 construim functiile f₁ ,f₂,f₃ ,...
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f₂ 1 1 2
---------------------------------------------
f₃ 1 2 1 fals
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f₄ 1 2 2 fals
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f₅ 2 1 1 fals
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f₆ 2 2 1 fals
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f₇ 2 1 2 fals
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f₈ 2 2 2 fals
⇒ 2 functii