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Formats a text message using string replacement to substitute parameter references with the value of the parameter. Parameter references are made by surrounding the parameter name within curly braces. For example the message "I feel {status}" references a variable named "status". The assumption is that "status" is an input to the action sequence, or an output of one of the preceding actions in the action sequence. If status=lucky the message generated by the action will read "I feel lucky".
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