# Chapter R - Review of Basic Concepts - R.1 Sets - R.1 Exercises - Page 8: 63

$\subseteq$

#### Work Step by Step

$A \subseteq B$ if all elements of set A are also elements of set B. Note that all elements of the set on the left are also elements of the set on the right. This means that the set on the left is a subset of the set on the right. Thus, the missing expression in the blank is $\subseteq$.

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