\myheading{Another example}

In place of epigraph:

\begin{framed}
\begin{quotation}
Suppose that you are organizing housing accommodations for a group of four hundred university students. Space is limited and only one hundred of the students will receive places in the dormitory. To complicate matters, the Dean has provided you with a list of pairs of incompatible students, and requested that no pair from this list appear in your final choice.
\end{quotation}
\end{framed}
( \url{https://www.claymath.org/millennium-problems/p-vs-np-problem} )

\myhrule{}

What if we want to divide our community/company/university by groups.
There are 16 persons and, which must be divided by 4 groups, 4 persons in each.
However, several persons hate each other, maybe, for personal reasons.
Can we group all them so the "haters" would be separated?

\lstinputlisting[style=custompy]{color/sched2.py}

The result:

\begin{lstlisting}
group 0, persons: [1, 2, 5, 8]
group 1, persons: [4, 7, 9, 12]
group 2, persons: [0, 3, 11, 13]
group 3, persons: [6, 10, 14, 15]
\end{lstlisting}