Hi Girishkrishna,

Very good question. I would watch the Grasshopper 101 and 102 courses where this is discussed more in detail.

https://thinkparametric.com/courses/grasshopper-101-introduction-to-parametric-modelling

https://thinkparametric.com/courses/grasshopper-102-data-lists-and-tree-structures

But there are various cases:

• One value with one value
• A list of values with one value
• A list of values with another list of values
• A grafted (data tree) list with one value
• A grafted list with another list
• A grafted list with another grafted list

I'm attaching an image with all these examples so you can check what happens in every case.