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p₁

p₂

p₃

p₄

f₁

0.7

[0.4, 0.8]

[0.1, 0.2, 0.7, 0.9]

$\left\{s_1,s_2\right\}$

f₂

0.8

[0.6, 0.7]

[0.2, 0.5, 06, 0.7]

$\left\{s_0,s_1,s_2,s_3\right\}$

f₃

0.6

[0.2, 0.4]

[0.3, 0.6, 0.7, 0.8]

$\left\{s_1,s_2,s_3\right\}$