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package fft_package is
TYPE complex IS ARRAY(0 TO 1) OF INTEGER;
function butterfly(X1, X2 , W : complex )return complex;
END fft_package;
package body fft_package is
function butterfly ( X1, X2 , W : complex )return complex is
BEGIN
return X1;
return X2;
END butterfly;
end fft_package;
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