How to create a chain of curves

Does anyone know of a grasshopper component or script that allows one to find chains of curve from a curve cloud?

By this I mean, an automated way fo finding a sequence of lines or curves whose start and end are coincidnt.

There is a sleect chain method in Rhino 5 but again that is manual. I have over 1500 lines on a doubly curved shape I need to organize in chains orthogonal to one another. No sequence of chains has a consistent bounding box that would contain that sequence,

I knwo how to create a scrit to do this but it will eb pretty complicated and Id prefer not to if there already exisst a compoennt or script for this,

Best

Steve