Mass addition of the numbers in one branch

Grasshopper
1

Hey there,

I have some trouble finding a solution to this problem.
Basically a have a list with of numbers. For example:

{0;0} 1
{1;0} 2
{2;0} 1
{3;0} 3
{3;1} 1
{4;0} 1
{4;1} 2

Now I would like to mass addition every number in the same branch. In this example branch 3 and 4.
So the end result should look like this:

{0} 1
{1} 2
{2} 1
{3} 4
{4} 3

Thanks in advance!

2

You can Shift paths first, then perform MA.

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