"des invitations d'anniversaire / des invitations à un
anniversaire"
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Yes, the noun 'invitations' is a common noun, a word for any
invitations of any kind.
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The Invitations was created on 1996-05-16.
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Nothing. You would get the capacity to send even more
invitations. You can never run out of Invitations.
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Yes psprint is the bet for you for what it is that you are
looking for. They have free templates for invitations that you can
download and use for your invitations.