[Solved] Add transitions to arrows beneath an equation

user2161721 Asks: Add transitions to arrows beneath an equation
I am trying to make simple transitions between the terme of a simple equation, I add them <+-| alert@+> to my items like so :

Code:
begin{frame}
frametitle{I-Vocabulary}
 begin{Vocabulary}{1-Addition}
begin{enumerate}
begin{itemize}
 begin{gather}
 mathterm[t1]{   27.32   }   +
 mathterm[t2]{   1.45  }   =
 mathterm[t3]{   28.77 }
 end{gather}
 end{itemize}
 item  First Terme indicate[red]{t1}[out=0,in=-75]
 item  Second Terme indicate[blue]{t2}[out=0,in=-90]
 item  the Sum indicate{t3}[out=0,in=-90]
  end{enumerate}
 end{Vocabulary}
 end{frame}

I get this
enter image description here

Now I need to add transitions, I try this :

Code:
begin{frame}
frametitle{I-Vocabulary}
 begin{Vocabulary}{1-Addition}


 begin{gather}
 mathterm[t1]{   27.32   }   +
 mathterm[t2]{   1.45  }   =
 mathterm[t3]{   28.77 }
 end{gather}
 begin{enumerate}[<+-| alert@+>]
 item [<+-| alert@+>]  First Terme indicate[red]{t1}[out=0,in=-75]
 item [<+-| alert@+>] Second Terme indicate[blue]{t2}[out=0,in=-90]
 item [<+-| alert@+>] the Sum indicate{t3}[out=0,in=-90]
  end{enumerate}
 end{Vocabulary}
 end{frame}

But its messing up the output, it’s clear what I want is to display the firt term (whilst the second and third are uncovered) then uncover the second one, then uncover the third one, but I am a not very familiar with this, can someone please help , thanks a lot !

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