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Progression

    Progression in “Blocks World“ – applying the progression algorithm

    Step 1:
      Initial state s0 = I = on(A, Table) ^ on(B, Table) ^ on(C, B) ^ clear(A) ^ clear(C) ^ handEmpty
    Step 2:
      Applicable actions: unstack(C,B), pickup(A)
    Step 3:
      result(s0, ‹unstack(C,B)›) = on(A, Table) ^ on(B, Table) ^ on(C, B) ^ clear(A) ^ clear(C) ^ handEmpty holding(x) ^ clear(y) \ on(x, y) ^ handEmpty ^ clear(x) = on(A, Table) ^ on(B, Table) ^ clear(A) ^ clear(B) ^ holding(C)
      result(s0, ‹pickup(A)›) = on(A, Table) ^ on(B, Table) ^ on(C, B) ^ clear(A) ^ clear(C) ^ handEmpty holding(x) \ on(x, Table) ^ handEmpty ^ clear(x) = on(B, Table) ^ on(C, B) ^ clear(C) ^ holding(A)

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