What is a:1-5 union a:6-10? Is it a:1-10 as the other monks have assumed? Or is "a:1-5 a:6-10" a better answer? (In other words, are these real or integral intervals?)

Also, what is a:1-5 union a:5-10? a:1-10 or "a:1-5 a:5-10"? (Are these open or closed intervals?)