i am using this program but its not working. please gime me any suggestion,,,

Question

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clear all clc; A=[1 2 39]; B=[1 2 3 25 30]; C=[4 5 6 8]; D=[5 6 7 11 31]; E=[8 9 39]; F=[10 11 13 32]; G=[6 10 11 12]; H=[10 12 13 14]; I=[4 13 14 15]; J=[16 17 18 27]; K=[16 19 20 33]; L=[21 22 23 35];

z=1; LA=length(A); LB=length(B); LC=length(C); LD=length(D); LE=length(E); LF=length(F); LG=length(G); LH=length(H); LI=length(I); LJ=length(J); LK=length(K); LL=length(L);

for i=1:LA

    for j=1:LB
        for k=1:LC
            for l=1:LD 
                for m=1:LE
                    for n=1:LF
                        for o=1:LG
                            for p=1:LH
                                for q=1:LI
                                    for r=1:LJ
                                        for s=1:LK
                                            for t=1:LL
                                                comb(z,:)=[A(1,i) B(1,j) C(1,k) D(1,l) E(1,m) F(1,n) G(1,o) H(1,p) I(1,q) J(1,r) K(1,s) L(1,t)]
                                                 z=z+1;
                                            end
                                        end
                                    end
                                end
                            end
                        end
                    end
                end
            end
        end
    end
end
comb