Woah
If Chelsea finish in the top four and win the Champions League then that releases another Europa Leauge place, so fifth and sixth places would qualify.
When Chelsea beat Liverpool in the FA Cup, Liverpool would normally qualify for the Europa League BUT they've already qualified by winning the Mickey Mouse cup so there's another place available there. Now, you might think Cardiff would get that place ... but do you know that or perhaps it would then fall to the next place in the Premiership, in other words, seventh.
So, there you have it. We'll qualify for Europe ... nailed on
*disclaimer - I have no idea how accurate any of this is.