You are equipped with a single 1, 3, 4, and 6 along with the ability to combine them using only addition, subtraction, multiplication, and division.
Your goal is to create each of the integers from 16 to 25.
You may use any number of parentheses to control the order of operations and in each case, you must use all four numbers exactly once. Additionally, you are not allowed to multiply or divide by the number 1 (i.e. 1 must be added or subtracted).
For example: 10 = 6 / 3 * (4 + 1)