anchor.diff:  <<by-step,`by()`>>. If a step is able to accept traversals or strings then `to()` is the
   means by which they are added. The general pattern is `step().to()`. See <<from-step,`from()`>>-step.
   
  +The list of steps that support `to()`-modulation are: <<simplepath-step,`simplePath()`>>, <<cyclicpath-step,`cyclicPath()`>>,
  + <<path-step,`path()`>>, and <<addedge-step,`addE()`>>.
   
   [[tree-step]]
   Tree Step
  
positive.code: The `from()`-step is not an actual step, but instead is a "step-modulator" similar to <<as-step,`as()`>> and
  <<by-step,`by()`>>. If a step is able to accept traversals or strings then `from()` is the
  means by which they are added. The general pattern is `step().from()`. See <<to-step,`to()`>>-step.
  
  [[group-step]]
  Group Step
  
negative.code: Option Step
  ~~~~~~~~~~~
  
  An option to a <<branch-step,`branch()`>> or <<choose-step,`choose()`>>.
  
  [[optional-step]]
  Optional Step
  