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Bold Common observations and mutual recursion
Deq subcases: improve readability
Fix beginning
Draw cases for Catenate
Draw other cases of pop from CatDeq
Explain the most complicated case of Pop on CatDeq
Fix nesting of ** and *
Improve terminology and common observations.
Fix grammar describing catenable deque/steque to use [] and {}
Explain mutually recursive structure and the notation with arrows.
Revert uglier arrows representing pairs and make binary trees slant consistently
Revert "Change direction of arrows in `CatSteq`, so it consistent with `Deq`" This reverts commit 3903c1fccb263831bfd93fed30c86ad076ded2e3.
Change direction of arrows in `CatSteq`, so it consistent with `Deq`
Improve notation for CatSteq
Write preliminary CatSteq notation
Finish ASCII art for Re-establishing invariant of Deq
Eliminate one header level