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ee=0;
           
for aa=0:NN            
    NN1=NN-aa;
    for bb=0:NN1         
        NN2=NN1-bb;
        for cc=0:NN2
            dd=NN2-cc;
           dat=abs(XX-(aa*A1+bb*B1+cc*C1+dd*D1));
           ee=1+ee;
           dat1(ee,1)=mean(dat();            
           pan(ee,=[aa bb cc dd];            
        end
    end
end
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