1. Okay, I'm not sure, but I think it's where the sheet protectors themselves can't have notes.1. Regarding only using 4 sheets, What does no annotations affixed mean? The instructions are vague, I don't understand if we can add our own things like pop-outs/glue-on?
2. Why do we need calculators?
2. We need calculators to calculate like ablation and accumulation zones, I think.