So, you are blindfolded and wearing thick gloves, and someone put twenty coins on the table. Ten of them are on heads and ten of them are on tails, but you wouldn't know which because of your blindfold and gloves. You could flip or move the coins if you want. Your goal is to group them into two with ten coins each. The two groups should have the same number of heads and the same number of tails. How do you do it?