PYTHAGORAS WALKS INTO A BAR WITH A PUZZLED LOOK ON HIS FACE AND MUTTERS "HMMMM. IF A RIGHT ANGLED TRIANGLE HAS A SHORT SIDE, X, A LONG SIDE, Y, AND A HYPOTENUSE, Z, THEN THE SQUARE OF Z MUST BE EQUAL TO THE SUM THE SQUARE OF X AND THE ERM, SQUARE OF ERM..."