In CloudFormation both nested stacks and modules encourage reusability by creating common components. From the AWS documentation it is not coming out when to us
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smtpappender
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contentobserver
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sql-graph
3gp
coin-flipping
titanium-mobile
tsql-parser
openxml
fluid-styled-content
android-download-manager
html5lib
azure-data-explorer
system
shadow-root
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drawable
command-timeout
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