.put pixel.  pixel x, pixel y, set pixel

.pixel x, x.  @pixel-x, temp, pixel x
.pixel x.  x back
.x back, temp.  x, x back
.x back.

.pixel y, y.  @pixel-y, temp, pixel y
.pixel y.  y back
.y back, temp.  y, y back
.y back.

.set pixel.  @set-pixel

.turning, right.  up
.turning, up.  left
.turning, left.  down
.turning, down.  right

.forward, right.  x, right
.forward, up, y.  up
.forward, left, x.  left
.forward, down. y,  down

.side, i.  put pixel, forward, safe i, side
.side.  turning, recover
.recover, safe i.  i, recover
.recover, i.  side
.recover.  done

.10 i.  i, i, i, i, i, i, i, i, i, i
.100 i.  10 i, 10 i, 10 i, 10 i, 10 i, 10 i, 10 i, 10 i, 10 i, 10 i
.256 i.  100 i, 100 i,
  10 i, 10 i, 10 i, 10 i, 10 i,
  i, i, i, i, i, i

.spiral.  side

.. x, x, x, x, x, x, x, x, x, x
.. y, y, y, y, y, y, y, y, y, y
.. down, 100 i, spiral