DYNAMIC DEPENDENT DROP DOWN LISTS IN GOOGLE SPREADSHEETS

This is a better, faster, simpler way to make dynamic, dependent drop down lists than I have in my other videos. The script is below. Remember to make a copy of it first. https://script.google.com/d/1-U7dOHp6V-mEYqgQPRKDp5Vwx4RCeaWKLO62xVsetNnLmocjHYO80-9_/edit?usp=sharing