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3. k1:. 3. k1<k 3. 3. (a:, z:{a...}. 3. (z-ak1 3. ( 3. ((f:({a...z}Peg). 3. ((f(a) = p & f(z) p 3. (( 3. (((x:{a...z-1}. (u:{a...x}. f(u) = p) & f(x+1) p))) 4. a : 5. z : {a...} 6. z-ak 7. f : {a...z}Peg 8. f(a) = p 9. f(z) p x:{a...z-1}. (u:{a...x}. f(u) = p) & f(x+1) p | 10 steps |
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