<p>EA+ED is allowed, although once you are accepted into ED, then you are bound to that school. However, it seems to me that you can at least still wait and see the UChi EA result, although widthrawing sound a more ‘ethical’ thing to do.</p>
<p>EA+SCEA is not allowed. I read in Yale board one kid applied Yale SCEA and UChi EA, saying that he/she would wait until Friday to see both Yale and UChi results simultaneously. I went back trying to find that post again, but it was buried under the more than 111 pages of SCEA hopefuls thread.</p>