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Left: diagram of a decision list dictated by regions R1 = {x ∈ ℝ2 : x1 > τ1}, R2 = {x ∈ ℝ2 : x1 ≤ τ1, x2 > τ2}, and R0 = {x ∈ ℝ2 : x1 ≤ τ1, x2 ≤ τ2}, and treatment recommendations a1, a2, and a0. Middle: representation of the decision list that requires only x1 in the first clause. Right: alternative representation of the same decision list that requires both x1 and x2 in the first clause.
