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Intrinsic functions
Basic programmatic functions available in-line for your declarative templates.
Retrieve external values (Ref, Fn::Sub, Fn::FindInMap, Fn::GetAtt,
Fn::GetAZs)
Manipulate strings (Fn::Sub, Fn::Split, Fn::Join, Fn::Base64,
Fn::Transform)
Conditional logic (Fn::If, Fn::Equals, Fn::Not)
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