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1st chunk of `content/includes/compose/interpolation.md`
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Values in a Compose file can be set by variables and interpolated at runtime. Compose files use a Bash-like
syntax `${VARIABLE}`. Both `$VARIABLE` and `${VARIABLE}` syntax is supported. 

Title: Variable Substitution in Compose Files
Summary
Compose files allow for dynamic configuration through variable substitution. Variables are referenced using Bash-like syntax, either `${VARIABLE}` or `$VARIABLE`.