Before revision:  We suggest that the reciprocation of these principles leads to a twist neutrality condition . I.e. to a zero sum rule for the incremental change in the rate of winding along the curve  .
After revision:  We suggest that the reciprocation of these principles leads to a twist neutrality condition . I.e. to a zero sum rule for the incremental change in the rate of winding along the curve , will behave neutrally to strain .