How can list All possible modes

Hi guys,

I have 2 kind of streams "HOT" and "COLD"

I want to consider all the possible modes that these streams can face each other,

means for example for 2 hot streams and 2 cold streams (h1 h2 and c1 c1)

it is important that which one face another and where,

consider a grid

case 1 : h1 vs c1 then h1 vs c2       and      h2 vs c1 then h2 vs c2
case 2 : h1 vs c2 then h2 vs c1       and      h1 vs c2 then h1 vs c1
case 3 : h2 vs c1 then h2 vs c2       and      h1 vs c1 then h1 vs c2
case 4 : h2 vs c2 then h1 vs c1       and      h2 vs c2 then h2 vs c1

these the all cases could happen ( m*n cases not n*n)

i hope explained it well,

could you help me how order matlab to do it?

sorry for my bad english