# 3.27

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Let's put into the black box whole set ${\displaystyle S=\{x_{i}\}_{i=1}^{n}}$. If ${\displaystyle bb(S)}$ is True, then such a subset exists and we can go on:
1. If ${\displaystyle bb(R/\{x_{i}\})}$ is True then ${\displaystyle R:=R/\{x_{i}\}}$