Triangle payment can be dispelled itself.
The situation is below. I was owed A $2, A was owed B 2$, B was owned me $2. So the $2 dollar shouldn't be calculated in my owe or owed number. By the way, I'm thinking of making a similar web like this. But I find this one is good. I'd like to contribute anything I can. Below is my mail.
If you’re in a group, you can go to group settings and turn on Simplify debts which will do this. If you’re not in a group, you will need to go to your account settings on the website and simplify debts outside of groups from there.
Marshall
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Antanas Muliuolis commented
"Simplify debts" function switches debt between users. Above mentioned case would delete the confusion when in the end you owe person who never lent you anything. "Simplify debts" should only include the above mentioned case, not the change of a debt owner.