@property<EOL><INDENT>def substitutions(self):<DEDENT>
return self._substitutions<EOL>
A list of Substitution objects. These substitutions will apply to
           the text and html content of  the body of your email, in addition
           to the subject and reply-to parameters. The total collective size
           of your substitutions may not exceed 10,000 bytes per
           personalization object.

        :rtype: list(Substitution)