Q1. THE FIRST ATTENDANCE QUESTION WAS:

What is a derangement?

A1. MY ANSWER TO THE FIRST ATTENDANCE QUESTION IS:

A derangement is a permutation of elements in a set such that no element is in its original position.

Q2. THE  SECOND ATTENDANCE QUESTION WAS:

Give two examples of WtoS and StoW

A2. MY ANSWER TO THE  SECOND ATTENDANCE QUESTION IS:

WtoS:

1. WtoS([0, 0, 1, 1, 0, 1]);
                           {3, 4, 6}

2. WtoS([1, 0, 1, 0, 1, 0, 1]);
                          {1, 3, 5, 7}

StoW:

1. StoW({1, 3, 5, 7}, 7);
                     [1, 0, 1, 0, 1, 0, 1]

2. StoW({2, 4, 6, 8}, 8);
                    [0, 1, 0, 1, 0, 1, 0, 1]