Remark 3.6.6.4. Let $f: X \rightarrow Y$ and $g: Y \rightarrow Z$ be Serre fibrations. Then the composition $(g \circ f): X \rightarrow Z$ is a Serre fibration.
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Remark 3.6.6.4. Let $f: X \rightarrow Y$ and $g: Y \rightarrow Z$ be Serre fibrations. Then the composition $(g \circ f): X \rightarrow Z$ is a Serre fibration.