Is there an "or" formula?

Is there an "or" formula to the {if} command?

Some examples of my question:

{if: invitation=="yes" OR "maybe"} send invite {endif}

{if: invitation=="yes" / "maybe"} send invite {endif}

{if: invitation==OR("yes", "maybe")} send invite {endif}

welcome to the community! yes there is, the format would be as follows:

{formmenu: default=yes; no; maybe; name=invitation}

{if: (invitation=="yes" OR invitation=="maybe")}send invite{endif}


It works, thank you so much!