Cello chopping notes?

I'm a relatively new, young cellist. I've been working on chopping, and I was wondering what some chords are. I need an A chord (1st finger G string), a C chord (4th finger G string), a G chord (4th finger D string), and an E chord (1st finger D string). Umm... I'm not sure if it would be considered a real chord, but I'm looking for a 2 note combo sorta thing. Thanks!