This macro allows you to specify that certain features are mutually exclusive.
It generates any combination of the selected features, by the combination formula:
n!/(2!*(n - 2)!), where n is the number of features.
For example, if you have 5 features, you will get 5!/(3!*2!) which is 10 combinations
or for 10 features, you will get 10!/(8!*2!) which is 45 combinations