Question: procedures in Mapleflow

Hi,

just a simple question: Is it possible to write procedures in Mapleflow, like (this is just a simple example, not what I would like to code!):

add4:=proc(a,b,c,d) a+b+c+d end proc

and, if so, how to do it? I've tried the above code but got the error

"expecting operator"

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