Three permutation-based matrix combinatorial sets were introduced: a) a matrix set of multipermutations of row entries; b) a matrix set of permutations of rows; c) a matrix set of multipermutations of ...

At issue was whether school systems are required to provide parents with an "opt-out" option when parents claim their religious beliefs conflict with their children's course material.

The Supreme Court ruled Friday that parents have a right to opt their schoolchildren out of classes and lessons that offend their religious beliefs.