Assertion: efficient frontier | /r/HasProperty | composed by following alternatives
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text: Figure 4 shows the efficient frontier, which is composed by the following alternatives: random, class-based 11 and class-based 13 in the first case (see Figure 4(a)), class-based 4 and class-based 12 (these had the same results), random, class-based 14 in the second case (see Figure 4(b)), random, class-based 4 and class-based 14 in the third case (see Figure 4(c)), and finally, random and class-based 14 in the last case (see Figure 4(d)).