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Regression

    Regression in “Blocks World“ – applying the regression algorithm
    Step 1:
      Goal state s n = G = on(B, Table) ^ on(C, B) ^ on(A, C) ^ clear(A) ^ handEmpty
    Step 2:
      Applicable actions: stack(A,C)
    Step 3:
      regress(G, stack(A,C)) = G \ add(stack ) pre(stack ) = on(B, Table) ^ on(C, B) ^ on(A, C) ^ clear(A) ^ handEmpty \ on(A,C) ^ handEmpty ^ clear(A) hoding(A) ^ clear(C) = on(B, Table) ^ on(C, B) ^ holding(A) ^ clear(C)

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