[CM] X Marks the Spot

[Esben Stien]

Lets say I make two marks, called mark1 and mark2. Now I want to make
two other marks: mark0 and mark3.

mark0=mark1-(mark2-mark1)
mark3=mark2+(mark2-mark1)

I'm trying to look at the marks.scm code, but I'm really stuck;). Are
there more code examples of using marks?.

Any pointers how to proceed?. 

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