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    function f = thisisparallel(Hd)
%THISISPARALLEL  True for filter with parallel stages.
%   THISISPARALLEL(Hd) returns 1 if filter Hd is composed of parallel stages,
%   and 0 otherwise. 
%
%   See also DFILT.   
  
%   Author: Thomas A. Bryan
%   Copyright 1988-2004 The MathWorks, Inc.

% This should be private

f = true;