removing repeats from lists

Hi, I'm struggling to figure out an output list 'd' which has all elements that are in both lists 'a' and 'b', but not in list 'c' using below:

a=[3 5 1 8]

b=[1 5 2]

c=[5 1 4 2]

d=[ ]

but this code only works when removing 'b' from 'a' to make list 'c'.

a=[3 5 1 8];

b=[1 5 2]

n=length(a); m=length(b); c=[ ];

for j=1:n

flag = 0;

k=0;

while flag == 0 && k

k=k+1;

if a(j) == b(k)

flag = 1;

end;

end;

if flag == 0

c=[c a(j)];

end;

end;

c

[Stephen23]

Not many elements:

a = [3,5,1,8];
b = [1,5,2];
c = [5,1,4,2];
d = setdiff(intersect(a,b),c)

d =

  1×0 empty double row vector

Answer 1

[David Hill]

d=intersect(a,b);
d=d(~ismember(d,c));