### `++peg`

Axis within axis

Computes the axis of `b` within axis `a`.

Accepts
-------

`a` is an atom.

`b` is an atom.

Produces
--------

An atom.

Source
------

    ++  peg                                                 ::  tree connect
      ~/  %peg
      |=  {a/@ b/@}
      ^-  @
      ?-  b
        $1  a
        $2  (mul a 2)
        $3  +((mul a 2))
        *   (add (mod b 2) (mul $(b (div b 2)) 2))
      ==

Examples
--------

    ~zod/try=>  (peg 4 1)
    4
    ~zod/try=>  (peg 4 2)
    8
    ~zod/try=>  (peg 8 45)
    269



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