cross checking list and making branches

Hello. i am very very new to grasshopper scripting(i'm trying to learn phyton scripting). i hope i can explain myself to you :)

i'm attaching a simple example of what i'm aiming for. actually this problem came up for pipe union.

so i have a list of lines(for example 10 lines) and i want to do for each item in the list create two lists that one is the "i" itself and the other is rest of lines(9 item) in a brach. so i think first list be the same list as grafted and the other is 10 branches with 9 items each. so with these list i will check curve|curve intersections and cull items and then do solid operation(union)

i have a little bit experience with scripting expecially with Processing, but as i said i'm new in ghphyton.