Adding pairs of numbers in sequence

I am trying to add (4) numbers in a list using the following logic:

#1 + #2
#2 + #3
#3 + #4

Thanks in advance for the help.

i tried this

That didn’t necessarily do what I wanted it to @Marcel_Rijsmus but it did spark something that took me to the solution. Thank You. See below.

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A bit shorter could be: