if two integers x , y ( x > y ) are selected from - 6 to 6 ( inclusive ) , how many cases are there ?
"there are 13 integers from - 6 to 6 inclusive . 13 c 2 = 78 . the answer is c ."
add(add(add(add(add(add(add(6, 6), add(6, const_2)), add(6, const_1)), 6), 6), const_2), const_1)