I was following tutorial on youtube. Its about to animate trimming of many splines generated from random particles points.(first picture)
I could come up to generate arc splines, but at animation part, the video said to loop objects in group, but in 2.8 I use collection instead of it. and also "Curve Object Output" node seemes changed from then.(second picture)
to compare, the third picture is from youtube which i try to study. I could generate only one preferable spline in fourth picture. but only one.