%
% bracket analysis for tracker readings
%

_brakn
{
%
% compare d and c against a, throw out b and/or c if snaps back to prior reading
%
_brakd _braka *trakchok
  {
%
% not same place
%
_brakd _brakb *trakchok
  {
%
% not same place
%
  }
  {
%
% same place, avoid c usage
%

   _brakc *trakbran
   _brakd !brakc
   3 !braks
  } ifelse


  }
  {
%
% same place, avoid b and c usage
%
   _brakb *trakbran _brakc *trakbran
   _brakd !brakb
   2 !braks
  } ifelse

} if