how to get combination of elements in a matrix in pair order

I have a matrix A=[3 5 6 7 8]

i want the output in the form B= [ 3 5

3 6

3 7

3 8

5 3

5 6

5 7

5 8...] like this

Answer 1

[Stephan]

A=[3    5    6    7    8];
b = nchoosek(A,2)

b =

     3     5
     3     6
     3     7
     3     8
     5     6
     5     7
     5     8
     6     7
     6     8
     7     8

[SANJOY MONDAL]

thank you sir

Answer 2

[Andrei Bobrov]

A=[3    5    6    7    8];

[y,x] = ndgrid(A);
B = [x(:),y(:)];
B = B(diff(B,1,2) ~= 0,:);