--------------

step
^^^^^^

Basis Function Combinator


Run a quoted program on each item in a sequence.
::

       ... [] [Q] . step
    -----------------------
          ... .


       ... [a] [Q] . step
    ------------------------
         ... a . Q


       ... [a b c] [Q] . step
    ----------------------------------------
             ... a . Q [b c] [Q] step

The step combinator executes the quotation on each member of the list
on top of the stack.


Gentzen diagram.


Definition
~~~~~~~~~~

if not basis.


Derivation
~~~~~~~~~~

if not basis.


Source
~~~~~~~~~~

if basis


Discussion
~~~~~~~~~~

Lorem ipsum.


Crosslinks
~~~~~~~~~~

Lorem ipsum.


